CVE-2026-31583
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.
View on NVDAnalysis
This Linux kernel vulnerability is a race condition specifically located in the em28xx driver for USB video capture devices. It does not warrant community attention because it requires specific, uncommon hardware to be present and is unlikely to affect standard server, container, or development environments.
Severity
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCWE-416EPSS
Affects
linux:linux_kernelTechnical 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.
References
- https://git.kernel.org/stable/c/5fb2940327722b4684d2f964b54c1c90aa277324
- https://git.kernel.org/stable/c/6b9e66437cc6123ddedac141e1b8b6fcf57d2972
- https://git.kernel.org/stable/c/871b8ea8ef39a6c253594649f4339378fad3d0dd
- https://git.kernel.org/stable/c/a66485a934c7187ae8e36517d40615fa2e961cff
- https://git.kernel.org/stable/c/b5d141ea15f173f15b9f0a72965902f3428c0d92
- https://git.kernel.org/stable/c/dd2b888e08d3b3d6aacd65d76cd44fac11da750f