SB2026091305 - Out-of-bounds read in Linux kernel md dm-pcache driver
Published: September 13, 2026
Security Bulletin ID
SB2026091305
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-80959)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to read past the segment data.
The vulnerability exists due to an out-of-bounds read in cache_pos_decode() in dm-pcache when decoding persisted key_tail and dirty_tail segment offsets from a supplied cache device. A local privileged user can supply a cache device containing a segment offset at or beyond the segment data size to read past the segment data.
Remediation
Install update from vendor's website.