NULL pointer dereference in Linux kernel - CVE-2026-31457
Published: April 24, 2026
Vulnerability identifier: #VU127686
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-31457
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 damon_sysfs_repeat_call_fn when handling sysfs updates to nr_contexts while DAMON is running. A local user can write 0 to the nr_contexts sysfs entry to cause a denial of service.
Exploitation requires access to the DAMON sysfs interface.
How to mitigate CVE-2026-31457
Install security update from vendor's repository.