FKIE_CVE-2026-31583

Vulnerability from fkie_nvd - Published: 2026-04-24 15:16 - Updated: 2026-04-24 17:51
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: media: em28xx: fix use-after-free in em28xx_v4l2_open() em28xx_v4l2_open() reads dev->v4l2 without holding dev->lock, creating a race with em28xx_v4l2_init()'s error path and em28xx_v4l2_fini(), both of which free the em28xx_v4l2 struct and set dev->v4l2 to NULL under dev->lock. This race leads to two issues: - use-after-free in v4l2_fh_init() when accessing vdev->ctrl_handler, since the video_device is embedded in the freed em28xx_v4l2 struct. - NULL pointer dereference in em28xx_resolution_set() when accessing v4l2->norm, since dev->v4l2 has been set to NULL. Fix this by moving the mutex_lock() before the dev->v4l2 read and adding a NULL check for dev->v4l2 under the lock.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5fb2940327722b4684d2f964b54c1c90aa277324
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6b9e66437cc6123ddedac141e1b8b6fcf57d2972
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/871b8ea8ef39a6c253594649f4339378fad3d0dd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dd2b888e08d3b3d6aacd65d76cd44fac11da750f
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: em28xx: fix use-after-free in em28xx_v4l2_open()\n\nem28xx_v4l2_open() reads dev-\u003ev4l2 without holding dev-\u003elock,\ncreating a race with em28xx_v4l2_init()\u0027s error path and\nem28xx_v4l2_fini(), both of which free the em28xx_v4l2 struct\nand set dev-\u003ev4l2 to NULL under dev-\u003elock.\n\nThis race leads to two issues:\n - use-after-free in v4l2_fh_init() when accessing vdev-\u003ectrl_handler,\n   since the video_device is embedded in the freed em28xx_v4l2 struct.\n - NULL pointer dereference in em28xx_resolution_set() when accessing\n   v4l2-\u003enorm, since dev-\u003ev4l2 has been set to NULL.\n\nFix this by moving the mutex_lock() before the dev-\u003ev4l2 read and\nadding a NULL check for dev-\u003ev4l2 under the lock."
    }
  ],
  "id": "CVE-2026-31583",
  "lastModified": "2026-04-24T17:51:40.810",
  "metrics": {},
  "published": "2026-04-24T15:16:33.017",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5fb2940327722b4684d2f964b54c1c90aa277324"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6b9e66437cc6123ddedac141e1b8b6fcf57d2972"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/871b8ea8ef39a6c253594649f4339378fad3d0dd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dd2b888e08d3b3d6aacd65d76cd44fac11da750f"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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