{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31473",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31473"
  ],
  "published": "2026-04-22T13:57:42Z",
  "summary": "media: mc, v4l2: serialize REINIT and REQBUFS with req_queue_mutex",
  "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31473"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
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      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "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."
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}