CVE-2026-53129

In the Linux kernel, the following vulnerability has been resolved:

fs/mbcache: cancel shrink work before destroying the cache

mb_cache_destroy() calls shrinker_free() and then frees all cache

entries and the cache itself, but it does not cancel the pending

c_shrink_work work item first.

If mb_cache_entry_create() schedules c_shrink_work via schedule_work()

and the work item is still pending or running when mb_cache_destroy()

runs, mb_cache_shrink_worker() will access the cache after its memory

has been freed, causing a use-after-free.

This is only reachable by a privileged user (root or CAP_SYS_ADMIN)

who can trigger the last put of a mounted ext2/ext4/ocfs2 filesystem.

Cancel the work item with cancel_work_sync() before calling

shrinker_free(), ensuring the worker has finished and will not be

rescheduled before the cache is torn down.