SB2026091302 - NULL pointer dereference in Linux kernel md dm-pcache driver
Published: September 13, 2026
Security Bulletin ID
SB2026091302
CSH 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 vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2026-80956)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.