CVE-2023-53990: Linux

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: SMB3: Add missing locks to protect deferred close file list cifs_del_deferred_close function has a critical section which modifies the deferred close file list. We must acquire deferred_lock before calling cifs_del_deferred_close function.

Affected products

• Linux Linux: from 5.15.63, before 5.15.111 (fixed in 5.15.111); from 5.19.4, before 5.20 (fixed in 5.20); from 6.0, before 6.1.28 (fixed in 6.1.28); from 6.2, before 6.2.15 (fixed in 6.2.15); from 6.3, before 6.3.2 (fixed in 6.3.2)

Published 2025-12-24. Last modified 2026-08-04.