CVE-2020-8835 (GCVE-0-2020-8835)

Vulnerability from cvelistv5 – Published: 2020-04-02 18:00 – Updated: 2024-09-17 02:15
VLAI
Title
Linux kernel bpf verifier vulnerability
Summary
In the Linux kernel 5.5.0 and newer, the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations, leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series, starting with v5.4.7, as the introducing commit was backported to that branch. This vulnerability was fixed in 5.6.1, 5.5.14, and 5.4.29. (issue is aka ZDI-CAN-10780)
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE
  • n/a
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux kernel Linux kernel Affected: 5.6-stable , < 5.6.1 (custom)
Affected: 5.5-stable , < 5.5.14 (custom)
Affected: 5.4.7 , < 5.4-stable* (custom)
guessed Create a notification for this product.
Date Public
2020-03-30 00:00
Credits
Manfred Paul Anatoly Trosinenko
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T10:12:10.621Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "USN-4313-1",
            "tags": [
              "vendor-advisory",
              "x_refsource_UBUNTU",
              "x_transferred"
            ],
            "url": "https://usn.ubuntu.com/4313-1/"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-results"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://lore.kernel.org/bpf/20200330160324.15259-1-daniel%40iogearbox.net/T/"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.openwall.com/lists/oss-security/2020/03/30/3"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://usn.ubuntu.com/usn/usn-4313-1"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef"
          },
          {
            "name": "FEDORA-2020-4ef0bcc89c",
            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F7OONYGMSYBEFHLHZJK3GOI5Z553G4LD/"
          },
          {
            "name": "FEDORA-2020-666f3b1ac3",
            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YXBWSHZ6DJIZVXKXGZPK6QPFCY7VKZEG/"
          },
          {
            "name": "FEDORA-2020-73c00eda1c",
            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TF4PQZBEPNXDSK5DOBMW54OCLP25FTCD/"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20200430-0004/"
          },
          {
            "name": "[oss-security] 20210720 CVE-2021-33909: size_t-to-int vulnerability in Linux\u0027s filesystem layer",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2021/07/20/1"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Linux kernel",
          "vendor": "Linux kernel",
          "versions": [
            {
              "lessThan": "5.6.1",
              "status": "affected",
              "version": "5.6-stable",
              "versionType": "custom"
            },
            {
              "lessThan": "5.5.14",
              "status": "affected",
              "version": "5.5-stable",
              "versionType": "custom"
            },
            {
              "changes": [
                {
                  "at": "5.4.29",
                  "status": "unaffected"
                }
              ],
              "lessThan": "5.4-stable*",
              "status": "affected",
              "version": "5.4.7",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Manfred Paul"
        },
        {
          "lang": "en",
          "value": "Anatoly Trosinenko"
        }
      ],
      "datePublic": "2020-03-30T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel 5.5.0 and newer, the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations, leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series, starting with v5.4.7, as the introducing commit was backported to that branch. This vulnerability was fixed in 5.6.1, 5.5.14, and 5.4.29. (issue is aka ZDI-CAN-10780)"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-07-20T14:06:18.000Z",
        "orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
        "shortName": "canonical"
      },
      "references": [
        {
          "name": "USN-4313-1",
          "tags": [
            "vendor-advisory",
            "x_refsource_UBUNTU"
          ],
          "url": "https://usn.ubuntu.com/4313-1/"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-results"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://lore.kernel.org/bpf/20200330160324.15259-1-daniel%40iogearbox.net/T/"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.openwall.com/lists/oss-security/2020/03/30/3"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://usn.ubuntu.com/usn/usn-4313-1"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef"
        },
        {
          "name": "FEDORA-2020-4ef0bcc89c",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F7OONYGMSYBEFHLHZJK3GOI5Z553G4LD/"
        },
        {
          "name": "FEDORA-2020-666f3b1ac3",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YXBWSHZ6DJIZVXKXGZPK6QPFCY7VKZEG/"
        },
        {
          "name": "FEDORA-2020-73c00eda1c",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TF4PQZBEPNXDSK5DOBMW54OCLP25FTCD/"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://security.netapp.com/advisory/ntap-20200430-0004/"
        },
        {
          "name": "[oss-security] 20210720 CVE-2021-33909: size_t-to-int vulnerability in Linux\u0027s filesystem layer",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2021/07/20/1"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Revert commit 581738a681b6 (\"bpf: Provide better register bounds after jmp32 instructions\")."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Linux kernel bpf verifier vulnerability",
      "workarounds": [
        {
          "lang": "en",
          "value": "Mitigation for this vulnerability is available by setting the kernel.unprivileged_bpf_disabled sysctl to 1:\n\n   $ sudo sysctl kernel.unprivileged_bpf_disabled=1\n   $ echo kernel.unprivileged_bpf_disabled=1 |  sudo tee /etc/sysctl.d/90-CVE-2020-8835.conf\n\nThis issue is also mitigated on systems that use secure boot with the kernel lockdown feature which blocks BPF program loading."
        }
      ],
      "x_generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security@ubuntu.com",
          "DATE_PUBLIC": "2020-03-30T16:00:00.000Z",
          "ID": "CVE-2020-8835",
          "STATE": "PUBLIC",
          "TITLE": "Linux kernel bpf verifier vulnerability"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "Linux kernel",
                      "version": {
                        "version_data": [
                          {
                            "version_affected": "\u003c",
                            "version_name": "5.6-stable",
                            "version_value": "5.6.1"
                          },
                          {
                            "version_affected": "\u003c",
                            "version_name": "5.5-stable",
                            "version_value": "5.5.14"
                          },
                          {
                            "version_affected": "\u003e=",
                            "version_name": "5.4-stable",
                            "version_value": "5.4.7"
                          },
                          {
                            "version_affected": "\u003c",
                            "version_name": "5.4-stable",
                            "version_value": "5.4.29"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "Linux kernel"
              }
            ]
          }
        },
        "credit": [
          {
            "lang": "eng",
            "value": "Manfred Paul"
          },
          {
            "lang": "eng",
            "value": "Anatoly Trosinenko"
          }
        ],
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "In the Linux kernel 5.5.0 and newer, the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations, leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series, starting with v5.4.7, as the introducing commit was backported to that branch. This vulnerability was fixed in 5.6.1, 5.5.14, and 5.4.29. (issue is aka ZDI-CAN-10780)"
            }
          ]
        },
        "generator": {
          "engine": "Vulnogram 0.0.9"
        },
        "impact": {
          "cvss": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          }
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "n/a"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "USN-4313-1",
              "refsource": "UBUNTU",
              "url": "https://usn.ubuntu.com/4313-1/"
            },
            {
              "name": "https://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-results",
              "refsource": "MISC",
              "url": "https://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-results"
            },
            {
              "name": "https://lore.kernel.org/bpf/20200330160324.15259-1-daniel@iogearbox.net/T/",
              "refsource": "MISC",
              "url": "https://lore.kernel.org/bpf/20200330160324.15259-1-daniel@iogearbox.net/T/"
            },
            {
              "name": "https://www.openwall.com/lists/oss-security/2020/03/30/3",
              "refsource": "MISC",
              "url": "https://www.openwall.com/lists/oss-security/2020/03/30/3"
            },
            {
              "name": "https://usn.ubuntu.com/usn/usn-4313-1",
              "refsource": "MISC",
              "url": "https://usn.ubuntu.com/usn/usn-4313-1"
            },
            {
              "name": "https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef",
              "refsource": "MISC",
              "url": "https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef"
            },
            {
              "name": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef",
              "refsource": "MISC",
              "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef"
            },
            {
              "name": "FEDORA-2020-4ef0bcc89c",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/F7OONYGMSYBEFHLHZJK3GOI5Z553G4LD/"
            },
            {
              "name": "FEDORA-2020-666f3b1ac3",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YXBWSHZ6DJIZVXKXGZPK6QPFCY7VKZEG/"
            },
            {
              "name": "FEDORA-2020-73c00eda1c",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TF4PQZBEPNXDSK5DOBMW54OCLP25FTCD/"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20200430-0004/",
              "refsource": "CONFIRM",
              "url": "https://security.netapp.com/advisory/ntap-20200430-0004/"
            },
            {
              "name": "[oss-security] 20210720 CVE-2021-33909: size_t-to-int vulnerability in Linux\u0027s filesystem layer",
              "refsource": "MLIST",
              "url": "http://www.openwall.com/lists/oss-security/2021/07/20/1"
            }
          ]
        },
        "solution": [
          {
            "lang": "en",
            "value": "Revert commit 581738a681b6 (\"bpf: Provide better register bounds after jmp32 instructions\")."
          }
        ],
        "source": {
          "discovery": "EXTERNAL"
        },
        "work_around": [
          {
            "lang": "en",
            "value": "Mitigation for this vulnerability is available by setting the kernel.unprivileged_bpf_disabled sysctl to 1:\n\n   $ sudo sysctl kernel.unprivileged_bpf_disabled=1\n   $ echo kernel.unprivileged_bpf_disabled=1 |  sudo tee /etc/sysctl.d/90-CVE-2020-8835.conf\n\nThis issue is also mitigated on systems that use secure boot with the kernel lockdown feature which blocks BPF program loading."
          }
        ]
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
    "assignerShortName": "canonical",
    "cveId": "CVE-2020-8835",
    "datePublished": "2020-04-02T18:00:23.885Z",
    "dateReserved": "2020-02-10T00:00:00.000Z",
    "dateUpdated": "2024-09-17T02:15:48.820Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2020-8835",
      "date": "2026-09-21",
      "epss": "0.0601",
      "percentile": "0.93076"
    },
    "nvd": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "4F715B99-43A7-4487-95F0-61A0C0D395D9",
                    "versionEndExcluding": "5.4.29",
                    "versionStartIncluding": "5.4.7",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "C1952E71-2355-44B6-99A9-8A7754C73458",
                    "versionEndExcluding": "5.5.14",
                    "versionStartIncluding": "5.5.0",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "67F018B4-5EAD-485E-AE88-63C5BF663268",
                    "versionEndExcluding": "5.6.1",
                    "versionStartIncluding": "5.6",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*",
                    "matchCriteriaId": "97A4B8DF-58DA-4AB6-A1F9-331B36409BA3",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*",
                    "matchCriteriaId": "80F0FA5D-8D3B-4C0E-81E2-87998286AF33",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*",
                    "matchCriteriaId": "36D96259-24BD-44E2-96D9-78CE1D41F956",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
                    "matchCriteriaId": "23A7C53F-B80F-4E6A-AFA9-58EEA84BE11D",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*",
                    "matchCriteriaId": "A31C8344-3E02-4EB8-8BD8-4C84B7959624",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "5C2089EE-5D7F-47EC-8EA5-0F69790564C4",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "A3C19813-E823-456A-B1CE-EC0684CE1953",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "A6E9EF0C-AFA8-4F7B-9FDC-1E0F7C26E737",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "E94F7F59-1785-493F-91A7-5F5EA5E87E4D",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:a700s_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "FDD92BFA-9117-4E6E-A13F-ED064B4B7284",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:a700s:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "4B7DA42F-5D64-4967-A2D4-6210FE507841",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:8300_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "4E73901F-666D-4D8B-BDFD-93DD2F70C74B",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:8300:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "D0FD5AED-42CF-4918-B32C-D675738EF15C",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:8700_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "34B25BEF-8708-4E2C-8BA6-EBCD5267EB04",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:8700:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "CE0F11D2-B5D9-46B4-BFC5-C86BC87D516A",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:a400_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "04E3BD77-8915-4FFC-8483-5DB5D610F829",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:a400:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "97E94ECB-BB51-4364-BEDD-8648C193196F",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:a320_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "6ADE5E80-06D3-4A1B-A655-FBB6CCA03939",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:a320:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "E8FD5E05-3C58-465F-9D4F-ECC2CD78DCFF",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:c190_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "75A43965-CB2E-4C28-AFC3-1ADE7A6B845C",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:c190:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "0D421A96-E6E9-4B27-ADE0-D8E87A82EEDE",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:a220_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "4F2D2745-242C-4603-899E-70C9025BDDD2",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:a220:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "EFB4541D-5EF7-4266-BFF3-2DDEC95E8012",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:fas2720_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "B7FD1DA9-7980-4643-B378-7095892DA176",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:fas2720:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "347E9E3E-941C-4109-B59F-B9BB05486B34",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:fas2750_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "AD661062-0D5B-4671-9D92-FEF8D7395C1E",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:fas2750:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "8155BF5F-DD1B-4AB4-81F8-9BCE6A8821AE",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:a800_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "B36CECA5-4545-49C2-92EB-B739407B207F",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:a800:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "D8E7549A-DE35-4274-B3F6-22D51C7A6613",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "6770B6C3-732E-4E22-BF1C-2D2FD610061C",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:h300s:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "9F9C8C20-42EB-4AB5-BD97-212DEB070C43",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "7FFF7106-ED78-49BA-9EC5-B889E3685D53",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:h500s:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "E63D8B0F-006E-4801-BF9D-1C001BBFB4F9",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "56409CEC-5A1E-4450-AA42-641E459CC2AF",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:h700s:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "B06F4839-D16A-4A61-9BB5-55B13F41E47F",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:h300e_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "108A2215-50FB-4074-94CF-C130FA14566D",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:h300e:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "7AFC73CE-ABB9-42D3-9A71-3F5BC5381E0E",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:h500e_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "32F0B6C0-F930-480D-962B-3F4EFDCC13C7",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:h500e:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "803BC414-B250-4E3A-A478-A3881340D6B8",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:h700e_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "0FEB3337-BFDE-462A-908B-176F92053CEC",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:h700e:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "736AEAE9-782B-4F71-9893-DED53367E102",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "D0B4AD8A-F172-4558-AEC6-FF424BA2D912",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:h410s:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "8497A4C9-8474-4A62-8331-3FE862ED4098",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:h610c_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "89612649-BACF-4FAC-9BA4-324724FD93A6",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:h610c:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "F3D9B255-C1AF-42D1-BF9B-13642FBDC080",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:h610s_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "FD7CFE0E-9D1E-4495-B302-89C3096FC0DF",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:h610s:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "F63A3FA7-AAED-4A9D-9FDE-6195302DA0F6",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:netapp:h615c_firmware:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "5921A877-18BF-43FE-915C-D226E140ACFC",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              },
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:h:netapp:h615c:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "7296A1F2-D315-4FD5-8A73-65C480C855BE",
                    "vulnerable": false
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ],
            "operator": "AND"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel 5.5.0 and newer, the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations, leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series, starting with v5.4.7, as the introducing commit was backported to that branch. This vulnerability was fixed in 5.6.1, 5.5.14, and 5.4.29. (issue is aka ZDI-CAN-10780)"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux versiones 5.5.0 y m\u00e1s recientes, el verificador bpf (kernel/bpf/verifier.c) no restringi\u00f3 apropiadamente los l\u00edmites de registro para operaciones de 32 bits, conllevando a lecturas y escrituras fuera de l\u00edmites en la memoria del kernel. La vulnerabilidad tambi\u00e9n afecta a la serie estable de Linux versi\u00f3n 5.4, comenzando con la versi\u00f3n v5.4.7, ya que el commit de introducci\u00f3n fue respaldado en esa derivaci\u00f3n. Esta vulnerabilidad fue corregida en las versiones 5.6.1, 5.5.14 y 5.4.29. (el problema tambi\u00e9n se conoce como ZDI-CAN-10780)"
          }
        ],
        "id": "CVE-2020-8835",
        "lastModified": "2024-11-21T05:39:32.163",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "HIGH",
              "cvssData": {
                "accessComplexity": "LOW",
                "accessVector": "LOCAL",
                "authentication": "NONE",
                "availabilityImpact": "COMPLETE",
                "baseScore": 7.2,
                "confidentialityImpact": "COMPLETE",
                "integrityImpact": "COMPLETE",
                "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C",
                "version": "2.0"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 10.0,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "nvd@nist.gov",
              "type": "Primary",
              "userInteractionRequired": false
            }
          ],
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.1,
              "impactScore": 6.0,
              "source": "security@ubuntu.com",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2020-04-02T18:15:18.943",
        "references": [
          {
            "source": "security@ubuntu.com",
            "tags": [
              "Exploit",
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2021/07/20/1"
          },
          {
            "source": "security@ubuntu.com",
            "tags": [
              "Patch",
              "Vendor Advisory"
            ],
            "url": "https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef"
          },
          {
            "source": "security@ubuntu.com",
            "tags": [
              "Patch",
              "Vendor Advisory"
            ],
            "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef"
          },
          {
            "source": "security@ubuntu.com",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F7OONYGMSYBEFHLHZJK3GOI5Z553G4LD/"
          },
          {
            "source": "security@ubuntu.com",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TF4PQZBEPNXDSK5DOBMW54OCLP25FTCD/"
          },
          {
            "source": "security@ubuntu.com",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YXBWSHZ6DJIZVXKXGZPK6QPFCY7VKZEG/"
          },
          {
            "source": "security@ubuntu.com",
            "url": "https://lore.kernel.org/bpf/20200330160324.15259-1-daniel%40iogearbox.net/T/"
          },
          {
            "source": "security@ubuntu.com",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20200430-0004/"
          },
          {
            "source": "security@ubuntu.com",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://usn.ubuntu.com/4313-1/"
          },
          {
            "source": "security@ubuntu.com",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://usn.ubuntu.com/usn/usn-4313-1"
          },
          {
            "source": "security@ubuntu.com",
            "tags": [
              "Mailing List",
              "Patch",
              "Third Party Advisory"
            ],
            "url": "https://www.openwall.com/lists/oss-security/2020/03/30/3"
          },
          {
            "source": "security@ubuntu.com",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-results"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Exploit",
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2021/07/20/1"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch",
              "Vendor Advisory"
            ],
            "url": "https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch",
              "Vendor Advisory"
            ],
            "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F7OONYGMSYBEFHLHZJK3GOI5Z553G4LD/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TF4PQZBEPNXDSK5DOBMW54OCLP25FTCD/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YXBWSHZ6DJIZVXKXGZPK6QPFCY7VKZEG/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lore.kernel.org/bpf/20200330160324.15259-1-daniel%40iogearbox.net/T/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20200430-0004/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://usn.ubuntu.com/4313-1/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://usn.ubuntu.com/usn/usn-4313-1"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Patch",
              "Third Party Advisory"
            ],
            "url": "https://www.openwall.com/lists/oss-security/2020/03/30/3"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-results"
          }
        ],
        "sourceIdentifier": "security@ubuntu.com",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-125"
              },
              {
                "lang": "en",
                "value": "CWE-787"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-06-28T07:41:07+00:00",
      "cve": "CVE-2020-8835",
      "id": "CVE-2020-8835",
      "initial_release_date": "2020-03-30T16:00:00+00:00",
      "product_status:known_not_affected": "104",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: out-of-bounds read/write in the bpf verifier",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-8835.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.