CVE-2026-53064

Name of the Vulnerable Software and Affected Versions Linux kernel version 6.19.0-rc7

Description In passthrough mode, a null pointer dereference occurs when dm-cache attempts to invalidate a cache entry while a concurrent write to the same cached block causes the bio prison cell lock to fail. In this scenario, the variable mg->cell remains NULL. The invalidate complete() function then attempts to unlock and free the cell unconditionally, leading to a system crash. This issue is triggered during concurrent write operations to the first cached block when the cache is in passthrough mode.

Recommendations Update the Linux kernel to a version where the invalidate complete() function is modified to verify if mg->cell is valid before attempting to unlock it.