CVE-2023-53848

A deadlock vulnerability was found in the md RAID5 cache (r5l) subsystem in the Linux kernel. In r5l_exit_log(), flush_work() is called while holding reconfig_mutex, which waits for disable_writeback_work to complete. However, r5c_disable_writeback_async() calls wait_event() which requires conf->log to be NULL, but that only happens after flush_work() returns, creating a deadlock.

This is a deadlock vulnerability in the RAID5 journaling cache subsystem that can cause system hangs when stopping RAID5 arrays with caching enabled. The impact is limited to systems using RAID5 with write-back caching.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.