CVE-2026-68150

A flaw was found in the Linux kernel. A local attacker could trigger a double-unlock vulnerability in the filesystem's emergency thaw operation. This occurs when the s_umount semaphore is released twice, leading to corruption of the semaphore's internal state. This corruption can cause system instability or a kernel crash, resulting in a denial of service.

This issue affects filesystem emergency thaw operations. do_thaw_all_callback() calls thaw_super_locked() which releases s_umount, but __iterate_supers() also unlocks it, causing double-unlock and semaphore corruption. Requires privileges to trigger emergency thaw.

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.