SB20251230203 - NULL pointer dereference in Linux kernel overlayfs
Published: December 30, 2025 Updated: December 30, 2025
Security Bulletin ID
SB20251230203
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) NULL pointer dereference (CVE-ID: CVE-2023-54313)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to NULL pointer dereference within the ovl_idmap_posix_acl() function in fs/overlayfs/inode.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/c4a5fb1ae5d3f02d3227afde2b9339994389463d
- https://git.kernel.org/stable/c/d536af163c53ce9f9bcfe87d2e9946f06f1a7ea4
- https://git.kernel.org/stable/c/d97481c7b2739a704848bb3c01f224dc71bdf78e
- https://git.kernel.org/stable/c/f4e19e595cc2e76a8a58413eb19d3d9c51328b53
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.121
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.40
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.4.4
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.5