CVE-2026-31583

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/3c0283a59e36e3707c4a81f4952e362d31f876b8
• https://git.kernel.org/stable/c/2cbf81f76842e46bdf25823c70e1db4044a65678
• https://git.kernel.org/stable/c/38a327221f7f765e7d853b7bafe47e342441ec85
• https://git.kernel.org/stable/c/b5d141ea15f173f15b9f0a72965902f3428c0d92
• https://git.kernel.org/stable/c/5fb2940327722b4684d2f964b54c1c90aa277324
• https://git.kernel.org/stable/c/871b8ea8ef39a6c253594649f4339378fad3d0dd
• https://git.kernel.org/stable/c/6b9e66437cc6123ddedac141e1b8b6fcf57d2972
• https://git.kernel.org/stable/c/dd2b888e08d3b3d6aacd65d76cd44fac11da750f
• https://git.kernel.org/stable/c/a66485a934c7187ae8e36517d40615fa2e961cff

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