Vulnerability-Lookup

GHSA-3535-JV42-VVC3

Vulnerability from github – Published: 2026-04-22 15:31 – Updated: 2026-04-27 15:30

Details

In the Linux kernel, the following vulnerability has been resolved:

media: mc, v4l2: serialize REINIT and REQBUFS with req_queue_mutex

MEDIA_REQUEST_IOC_REINIT can run concurrently with VIDIOC_REQBUFS(0) queue teardown paths. This can race request object cleanup against vb2 queue cancellation and lead to use-after-free reports.

We already serialize request queueing against STREAMON/OFF with req_queue_mutex. Extend that serialization to REQBUFS, and also take the same mutex in media_request_ioctl_reinit() so REINIT is in the same exclusion domain.

This keeps request cleanup and queue cancellation from running in parallel for request-capable devices.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31473"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-22T14:16:43Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: mc, v4l2: serialize REINIT and REQBUFS with req_queue_mutex\n\nMEDIA_REQUEST_IOC_REINIT can run concurrently with VIDIOC_REQBUFS(0)\nqueue teardown paths. This can race request object cleanup against vb2\nqueue cancellation and lead to use-after-free reports.\n\nWe already serialize request queueing against STREAMON/OFF with\nreq_queue_mutex. Extend that serialization to REQBUFS, and also take\nthe same mutex in media_request_ioctl_reinit() so REINIT is in the\nsame exclusion domain.\n\nThis keeps request cleanup and queue cancellation from running in\nparallel for request-capable devices.",
  "id": "GHSA-3535-jv42-vvc3",
  "modified": "2026-04-27T15:30:38Z",
  "published": "2026-04-22T15:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31473"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1a0d9083c24fbd5d22f7100f09d11e4d696a5f01"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c685e99efb3b3bd2b78699fba6b1cf321975db0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/331242998a7ade5c2f65e14988901614629f3db5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/585fd9a2063dacce8b2820f675ef23d5d17434c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/72b9e81e0203f03c40f3adb457f55bd4c8eb112d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bef4f4a88b73e4cc550d25f665b8a9952af22773"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf2023e84f0888f96f4b65dc0804e7f3651969c1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d8549a453d5bdc0a71de66ad47a1106703406a56"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-31473 (GCVE-0-2026-31473)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-08-05 12:22

Title

media: mc, v4l2: serialize REINIT and REQBUFS with req_queue_mutex

Summary

In the Linux kernel, the following vulnerability has been resolved: media: mc, v4l2: serialize REINIT and REQBUFS with req_queue_mutex MEDIA_REQUEST_IOC_REINIT can run concurrently with VIDIOC_REQBUFS(0) queue teardown paths. This can race request object cleanup against vb2 queue cancellation and lead to use-after-free reports. We already serialize request queueing against STREAMON/OFF with req_queue_mutex. Extend that serialization to REQBUFS, and also take the same mutex in media_request_ioctl_reinit() so REINIT is in the same exclusion domain. This keeps request cleanup and queue cancellation from running in parallel for request-capable devices.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/331242998a7ade5c2…
https://git.kernel.org/stable/c/2c685e99efb3b3bd2…
https://git.kernel.org/stable/c/585fd9a2063dacce8…
https://git.kernel.org/stable/c/1a0d9083c24fbd5d2…
https://git.kernel.org/stable/c/d8549a453d5bdc0a7…
https://git.kernel.org/stable/c/72b9e81e0203f03c4…
https://git.kernel.org/stable/c/cf2023e84f0888f96…
https://git.kernel.org/stable/c/bef4f4a88b73e4cc5…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 , < 331242998a7ade5c2f65e14988901614629f3db5 (git) Affected: 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 , < 2c685e99efb3b3bd2b78699fba6b1cf321975db0 (git) Affected: 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 , < 585fd9a2063dacce8b2820f675ef23d5d17434c5 (git) Affected: 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 , < 1a0d9083c24fbd5d22f7100f09d11e4d696a5f01 (git) Affected: 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 , < d8549a453d5bdc0a71de66ad47a1106703406a56 (git) Affected: 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 , < 72b9e81e0203f03c40f3adb457f55bd4c8eb112d (git) Affected: 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 , < cf2023e84f0888f96f4b65dc0804e7f3651969c1 (git) Affected: 6093d3002eabd7c2913d97f1d1f4ce34b072acf9 , < bef4f4a88b73e4cc550d25f665b8a9952af22773 (git)
Linux	Linux	Affected: 4.20 Unaffected: 0 , < 4.20 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.131 , ≤ 6.6.* (semver) Unaffected: 6.12.80 , ≤ 6.12.* (semver) Unaffected: 6.18.21 , ≤ 6.18.* (semver) Unaffected: 6.19.11 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/mc/mc-request.c",
            "drivers/media/v4l2-core/v4l2-ioctl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "331242998a7ade5c2f65e14988901614629f3db5",
              "status": "affected",
              "version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9",
              "versionType": "git"
            },
            {
              "lessThan": "2c685e99efb3b3bd2b78699fba6b1cf321975db0",
              "status": "affected",
              "version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9",
              "versionType": "git"
            },
            {
              "lessThan": "585fd9a2063dacce8b2820f675ef23d5d17434c5",
              "status": "affected",
              "version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9",
              "versionType": "git"
            },
            {
              "lessThan": "1a0d9083c24fbd5d22f7100f09d11e4d696a5f01",
              "status": "affected",
              "version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9",
              "versionType": "git"
            },
            {
              "lessThan": "d8549a453d5bdc0a71de66ad47a1106703406a56",
              "status": "affected",
              "version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9",
              "versionType": "git"
            },
            {
              "lessThan": "72b9e81e0203f03c40f3adb457f55bd4c8eb112d",
              "status": "affected",
              "version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9",
              "versionType": "git"
            },
            {
              "lessThan": "cf2023e84f0888f96f4b65dc0804e7f3651969c1",
              "status": "affected",
              "version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9",
              "versionType": "git"
            },
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              "status": "affected",
              "version": "6093d3002eabd7c2913d97f1d1f4ce34b072acf9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/mc/mc-request.c",
            "drivers/media/v4l2-core/v4l2-ioctl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.20"
            },
            {
              "lessThan": "4.20",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.168",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.131",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.80",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.21",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.11",
              "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": "5.10.253",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.203",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.168",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.80",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.21",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.11",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                }
              ],
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          ]
        }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: mc, v4l2: serialize REINIT and REQBUFS with req_queue_mutex\n\nMEDIA_REQUEST_IOC_REINIT can run concurrently with VIDIOC_REQBUFS(0)\nqueue teardown paths. This can race request object cleanup against vb2\nqueue cancellation and lead to use-after-free reports.\n\nWe already serialize request queueing against STREAMON/OFF with\nreq_queue_mutex. Extend that serialization to REQBUFS, and also take\nthe same mutex in media_request_ioctl_reinit() so REINIT is in the\nsame exclusion domain.\n\nThis keeps request cleanup and queue cancellation from running in\nparallel for request-capable devices."
        }
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      "metrics": [
        {
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            "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 paths are reached through local `ioctl()` calls on media/video device file descriptors: `MEDIA_REQUEST_IOC_REINIT` on a request fd and `VIDIOC_REQBUFS(0)` on a V4L2 video fd. The affected code is not reachable directly from network packets or adjacent/physical protocol input.\nAC:L - This is a race, but an attacker controls both racing operations by issuing concurrent ioctls from local threads or processes. No condition beyond access to a request-capable media device is required.\nPR:L - The kernel path has no capability or admin check; the attacker only needs ordinary local ability to open the relevant `/dev/media*` and `/dev/video*` nodes. This is basic local privilege rather than real root/admin privilege.\nUI:N - Once the attacker can run local code and open the device nodes, exploitation is driven entirely by attacker-issued ioctls. No separate victim action is required.\nS:U - The vulnerability corrupts kernel media/videobuf2 request state within the same kernel security authority. It is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - The bug is a use-after-free involving media request objects and vb2 buffer/request state during concurrent cleanup and queue teardown. Per kernel CVSS guidance, UAF memory corruption can be leveraged for kernel memory disclosure, so confidentiality impact is high.\nI:H - The race can corrupt freed kernel heap objects and request/buffer state, giving a plausible path to control-flow or arbitrary-write style exploitation. Per kernel CVSS guidance, use-after-free memory corruption warrants high integrity impact.\nA:H - The fix commit explicitly addresses use-after-free reports, and such kernel UAFs can reliably trigger KASAN reports, oopses, or panics. This is a high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:22:51.779Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/331242998a7ade5c2f65e14988901614629f3db5"
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        },
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          "url": "https://git.kernel.org/stable/c/72b9e81e0203f03c40f3adb457f55bd4c8eb112d"
        },
        {
          "url": "https://git.kernel.org/stable/c/cf2023e84f0888f96f4b65dc0804e7f3651969c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/bef4f4a88b73e4cc550d25f665b8a9952af22773"
        }
      ],
      "title": "media: mc, v4l2: serialize REINIT and REQBUFS with req_queue_mutex",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31473",
    "datePublished": "2026-04-22T13:54:00.970Z",
    "dateReserved": "2026-03-09T15:48:24.098Z",
    "dateUpdated": "2026-08-05T12:22:51.779Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-3535-JV42-VVC3

CVE-2026-31473 (GCVE-0-2026-31473)

Tags

Sightings

Nomenclature

Related by attack behaviour