NULL Pointer Dereference in Linux kernel - CVE-2026-23249
Published: March 20, 2026
Vulnerability identifier: #VU124199
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-23249
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in the XFS filesystem's btree revalidation functionality when handling ioctl requests. A local user can trigger a specially crafted ioctl request to cause a null pointer dereference and crash the system.
The attacker must have privileges to perform XFS filesystem scrub operations, which typically requires administrative privileges.
How to mitigate CVE-2026-23249
Install security update from vendor's repository.