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CVE-2024-56627 (GCVE-0-2024-56627)

Vulnerability from cvelistv5 – Published: 2024-12-27 14:51 – Updated: 2026-08-05 11:45
VLAI
Title
ksmbd: fix Out-of-Bounds Read in ksmbd_vfs_stream_read
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix Out-of-Bounds Read in ksmbd_vfs_stream_read An offset from client could be a negative value, It could lead to an out-of-bounds read from the stream_buf. Note that this issue is coming when setting 'vfs objects = streams_xattr parameter' in ksmbd.conf.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 20:00 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 6bd1bf0e8c42f10a9a9679a4c103a9032d30594d (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < de4d790dcf53be41736239d7ee63849a16ff5d10 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 27de4295522e9a33e4a3fc72f7b8193df9eebe41 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 81eed631935f2c52cdaf6691c6d48e0b06e8ad73 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < fc342cf86e2dc4d2edb0fc2ff5e28b6c7845adb9 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.176 , ≤ 5.15.* (semver)
Unaffected: 6.1.120 , ≤ 6.1.* (semver)
Unaffected: 6.6.66 , ≤ 6.6.* (semver)
Unaffected: 6.12.5 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/81eed631935f2c52cdaf6691c6d48e0b06e8ad73"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/de4d790dcf53be41736239d7ee63849a16ff5d10"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/fc342cf86e2dc4d2edb0fc2ff5e28b6c7845adb9"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-125"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-125"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-12T12:18:01+00:00",
      "cve": "CVE-2024-56627",
      "id": "CVE-2024-56627",
      "initial_release_date": "2024-12-27T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: fix Out-of-Bounds Read in ksmbd_vfs_stream_read",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-56627.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2025-11-03T20:51:16.745Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "LOCAL",
                  "availabilityImpact": "HIGH",
                  "baseScore": 7.1,
                  "baseSeverity": "HIGH",
                  "confidentialityImpact": "HIGH",
                  "integrityImpact": "NONE",
                  "privilegesRequired": "LOW",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2024-56627",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-10-01T20:00:48.902752Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-125",
                    "description": "CWE-125 Out-of-bounds Read",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-10-01T15:43:54.562Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "fs/smb/server/smb2pdu.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "6bd1bf0e8c42f10a9a9679a4c103a9032d30594d",
                  "status": "affected",
                  "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
                  "versionType": "git"
                },
                {
                  "lessThan": "de4d790dcf53be41736239d7ee63849a16ff5d10",
                  "status": "affected",
                  "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
                  "versionType": "git"
                },
                {
                  "lessThan": "27de4295522e9a33e4a3fc72f7b8193df9eebe41",
                  "status": "affected",
                  "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
                  "versionType": "git"
                },
                {
                  "lessThan": "81eed631935f2c52cdaf6691c6d48e0b06e8ad73",
                  "status": "affected",
                  "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
                  "versionType": "git"
                },
                {
                  "lessThan": "fc342cf86e2dc4d2edb0fc2ff5e28b6c7845adb9",
                  "status": "affected",
                  "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "fs/smb/server/smb2pdu.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.15"
                },
                {
                  "lessThan": "5.15",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.176",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.120",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.66",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.5",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.13",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.176",
                      "versionStartIncluding": "5.15",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.120",
                      "versionStartIncluding": "5.15",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.66",
                      "versionStartIncluding": "5.15",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.5",
                      "versionStartIncluding": "5.15",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.13",
                      "versionStartIncluding": "5.15",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix Out-of-Bounds Read in ksmbd_vfs_stream_read\n\nAn offset from client could be a negative value, It could lead\nto an out-of-bounds read from the stream_buf.\nNote that this issue is coming when setting\n\u0027vfs objects = streams_xattr parameter\u0027 in ksmbd.conf."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 8.1,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:N - ksmbd is the in-kernel SMB server listening on TCP/445; the malicious `Offset` field arrives in an SMB2 READ request from a remote peer over the network. No local access to the target is needed.\nAC:L - The attacker fully and deterministically controls both the negative offset and the read length, and creates all preconditions itself (open `file:stream`, write one byte, then read at a negative offset); no race, no memory-layout luck, and no condition outside the attacker\u0027s control is required.\nPR:L - `smb2_check_user_session()` requires an established SMB2 session and tree connect before SMB2_READ is dispatched, so the attacker needs credentials for the share (or a guest-ok share), i.e. the privileges of an ordinary SMB user.\nUI:N - The entire sequence (CREATE with a stream name, WRITE, READ with negative offset) is driven by the attacker\u0027s own SMB connection; no administrator or user on the target has to do anything.\nS:U - The out-of-bounds read and its disclosure occur wholly within the kernel\u0027s security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The attacker-controlled 64-bit negative displacement turns `memcpy(buf, \u0026stream_buf[*pos], count)` into an effectively arbitrary kernel-memory read of up to 4 MB per request, and the bytes are returned directly to the remote client in the READ response \u2014 disclosing kernel pointers, credentials, keys, and other users\u0027 cached file data, repeatably.\nI:N - The defect is purely a read; the destination `aux_payload_buf` is `kvzalloc(length)` with `count \u003c= length`, so no kernel memory is written or corrupted by this bug.\nA:H - A large negative offset makes the kernel `memcpy` from an unmapped or invalid address, producing an unhandled kernel page fault/oops that kills the ksmbd worker thread and panics the box on `panic_on_oops` configurations; it can be retriggered at will."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:45:32.397Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/6bd1bf0e8c42f10a9a9679a4c103a9032d30594d"
            },
            {
              "url": "https://git.kernel.org/stable/c/de4d790dcf53be41736239d7ee63849a16ff5d10"
            },
            {
              "url": "https://git.kernel.org/stable/c/27de4295522e9a33e4a3fc72f7b8193df9eebe41"
            },
            {
              "url": "https://git.kernel.org/stable/c/81eed631935f2c52cdaf6691c6d48e0b06e8ad73"
            },
            {
              "url": "https://git.kernel.org/stable/c/fc342cf86e2dc4d2edb0fc2ff5e28b6c7845adb9"
            }
          ],
          "title": "ksmbd: fix Out-of-Bounds Read in ksmbd_vfs_stream_read",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-56627",
        "datePublished": "2024-12-27T14:51:29.854Z",
        "dateReserved": "2024-12-27T14:03:06.018Z",
        "dateUpdated": "2026-08-05T11:45:32.397Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.