CVE-2026-89887

Description

In the Linux kernel, the following vulnerability has been resolved: media: i2c: ov7740: fix use-after-destroy in remove The ov7740_remove() function had a severe teardown order bug where it destroyed the driver's mutex before freeing the V4L2 control handler which relies on that mutex, leading to a use-after-destroy kernel panic. Furthermore, the driver explicitly called v4l2_ctrl_handler_free() and mutex_destroy() sequentially, but then called ov7740_free_controls() which invokes both of them a second time, resulting in a double-free. This patch fixes the issue by unregistering the subdevice first, and relying exclusively on ov7740_free_controls() to safely tear down the mutex and control handler in the correct order.

References

• https://git.kernel.org/stable/c/09453b467990e8ef8fe09f45a685f9a625248d33
• https://git.kernel.org/stable/c/25e2505866c577db2661e4d431f0907c6ec9a3b4
• https://git.kernel.org/stable/c/5d1b3dea5a44124bab6c14a2d71b977dabed54e7
• https://git.kernel.org/stable/c/7512838a19af0a284a58435292243fad21e57ff1
• https://git.kernel.org/stable/c/81e9765878d3ac8ad18e3a683332b5d6bc3a0e33