SB20251226258 - Improper locking in Linux kernel cifs
Published: December 26, 2025 Updated: December 31, 2025
Security Bulletin ID
SB20251226258
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper locking (CVE-ID: CVE-2023-53990)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper locking within the cifs_close_deferred_file(), cifs_close_all_deferred_files() and cifs_close_deferred_file_under_dentry() functions in fs/cifs/misc.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/0f87e18203bd30f71eb1a65259e28e291b6cc43a
- https://git.kernel.org/stable/c/32a046ccaeea6c19965c04a4c521e703f6607924
- https://git.kernel.org/stable/c/3aa9d065b0685b4e6052f3f2a2462966fdc44fd2
- https://git.kernel.org/stable/c/ab9ddc87a9055c4bebd6524d5d761d605d52e557
- https://git.kernel.org/stable/c/cb36365dac25d546ca4af0eb22acb43c9b4ddfdf
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.2.15