CVE-2026-89887
HighCVSS 7.8Summary
In the Linux kernel media i2c ov7740 driver, ov7740_remove() had a severe teardown order bug where it destroyed the driver's mutex before freeing the V4L2 control handler that relies on that mutex, leading to a use-after-destroy kernel panic. Additionally, the driver called v4l2_ctrl_handler_free() and mutex_destroy() sequentially, then called ov7740_free_controls() which invokes both again, resulting in a double-free.
Risk Assessment
Use-after-destroy and double-free can lead to kernel panic, memory corruption, or potential exploitation for privilege escalation.
Recommendation
Update the Linux kernel to a version with the fix that unregisters the subdevice first and relies exclusively on ov7740_free_controls() to safely tear down the mutex and control handler.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS