NULL pointer dereference in Linux kernel - CVE-2026-80956
Published: September 13, 2026
Vulnerability identifier: #VU149436
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2026-80956
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in get_cache_segment() in the dm-pcache cache_segment component when processing a crafted cache image. A local user can provide a crafted cache image to cause a denial of service.
The issue occurs when cache_info.n_segs is smaller than the physical device segment count.
Affected software
Linux kernel
How to mitigate CVE-2026-80956
Install security update from vendor's repository.