CVE-2026-80959 Linux Kernel dm-pcache - Out of Bounds Read

Linux kernel dm-pcache contains a buffer overflow caused by unchecked segment offset in cache_pos_decode(), letting attackers with CAP_SYS_ADMIN privileges read past segment data, exploit requires CAP_SYS_ADMIN privileges.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out of Bounds Read
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version with dm-pcache patch applied.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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