CVE-2026-31583
Description
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.
How to fix
- linux linux_kernel6.6.136, 6.12.83, 6.18.24, 6.19.14, 7.0.1 or later
- git.kernel.org/stable/c/5fb2940327722b4684d2f964b54c1c90aa277324
- git.kernel.org/stable/c/6b9e66437cc6123ddedac141e1b8b6fcf57d2972
- git.kernel.org/stable/c/871b8ea8ef39a6c253594649f4339378fad3d0dd
- git.kernel.org/stable/c/a66485a934c7187ae8e36517d40615fa2e961cff
- git.kernel.org/stable/c/b5d141ea15f173f15b9f0a72965902f3428c0d92
- git.kernel.org/stable/c/dd2b888e08d3b3d6aacd65d76cd44fac11da750f
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v < 6.6.136, 6.12 ≤ v < 6.12.83, 6.13 ≤ v < 6.18.24, 6.19 ≤ v < 6.19.14, 7.0 ≤ v < 7.0.1 | 6.6.136, 6.12.83, 6.18.24, 6.19.14, 7.0.1 |
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