CVE-2026-31401 (GCVE-0-2026-31401)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:16 – Updated: 2026-10-19 18:35
VLAI
Title
HID: bpf: prevent buffer overflow in hid_hw_request
Summary
In the Linux kernel, the following vulnerability has been resolved: HID: bpf: prevent buffer overflow in hid_hw_request right now the returned value is considered to be always valid. However, when playing with HID-BPF, the return value can be arbitrary big, because it's the return value of dispatch_hid_bpf_raw_requests(), which calls the struct_ops and we have no guarantees that the value makes sense.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:08 UTC
CWE
  • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6856 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8bd0488b5ea58655ad6fdcbe0408ef49b16882b1 , < d6efaa50af62fb0790dd1fd4e7e5506b46312510 (git)
Affected: 8bd0488b5ea58655ad6fdcbe0408ef49b16882b1 , < 73c5b5aea1c443239c8cb4191b4af7a4bd6fd7b1 (git)
Affected: 8bd0488b5ea58655ad6fdcbe0408ef49b16882b1 , < eb57dae20fdf6f3069cdc07821fa3bb46de381d7 (git)
Affected: 8bd0488b5ea58655ad6fdcbe0408ef49b16882b1 , < 2b658c1c442ec1cd9eec5ead98d68662c40fe645 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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                  "version": "8bd0488b5ea58655ad6fdcbe0408ef49b16882b1",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/hid/bpf/hid_bpf_dispatch.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "6.11"
                },
                {
                  "lessThan": "6.11",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.78",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.18.*",
                  "status": "unaffected",
                  "version": "6.18.20",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.19.*",
                  "status": "unaffected",
                  "version": "6.19.10",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.0",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.78",
                      "versionStartIncluding": "6.11",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.18.20",
                      "versionStartIncluding": "6.11",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.19.10",
                      "versionStartIncluding": "6.11",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.0",
                      "versionStartIncluding": "6.11",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: bpf: prevent buffer overflow in hid_hw_request\n\nright now the returned value is considered to be always valid. However,\nwhen playing with HID-BPF, the return value can be arbitrary big,\nbecause it\u0027s the return value of dispatch_hid_bpf_raw_requests(), which\ncalls the struct_ops and we have no guarantees that the value makes\nsense."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The vulnerable `memcpy()` is reached through local `bpf()` operations that load/attach HID-BPF `struct_ops` programs and run a HID-BPF syscall program; it is not reachable directly from remote packets or unauthenticated HID traffic alone.\nAC:L - An attacker who can load the needed HID-BPF programs controls the oversized `hid_hw_request` callback return value and can invoke `hid_bpf_hw_request()` directly, with no race or external timing condition.\nPR:L - Loading HID-BPF requires BPF privileges such as CAP_BPF/CAP_PERFMON, but these can be delegated through BPF tokens into non-init user namespaces in plausible containerized deployments. Choosing the higher-severity option, this is treated as low rather than high privileges.\nUI:N - No victim interaction is required after the attacker has local BPF access; the attacker can attach the callback and run the syscall BPF program themselves.\nS:U - The corruption occurs within the kernel security authority and represents a standard local kernel compromise path, not a VM escape or other cross-scope boundary.\nC:H - The unchecked return value causes an out-of-bounds read from the `dma_data` kernel heap buffer into BPF-accessible memory, allowing disclosure of adjacent kernel memory. As memory corruption, it is also potentially usable to build stronger read primitives.\nI:H - The same unchecked return value is used as the length for `memcpy()` into the caller-provided BPF memory buffer, producing an out-of-bounds kernel write. Such kernel memory corruption is defensibly capable of arbitrary modification or control-flow compromise.\nA:H - A large attacker-controlled copy length can corrupt kernel memory or fault during the copy, causing an oops, panic, or system crash."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T12:22:09.102Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/d6efaa50af62fb0790dd1fd4e7e5506b46312510"
            },
            {
              "url": "https://git.kernel.org/stable/c/73c5b5aea1c443239c8cb4191b4af7a4bd6fd7b1"
            },
            {
              "url": "https://git.kernel.org/stable/c/eb57dae20fdf6f3069cdc07821fa3bb46de381d7"
            },
            {
              "url": "https://git.kernel.org/stable/c/2b658c1c442ec1cd9eec5ead98d68662c40fe645"
            }
          ],
          "title": "HID: bpf: prevent buffer overflow in hid_hw_request",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-31401",
        "datePublished": "2026-04-03T15:16:04.903Z",
        "dateReserved": "2026-03-09T15:48:24.086Z",
        "dateUpdated": "2026-10-19T18:35:46.408Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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