High severity · published Sep 11, 2026
CVE-2026-80959
dm-pcache: bound the persisted tail-position offset
7.8
CVSS
0.2%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
dm-pcache: bound the persisted tail-position offset
cache_pos_decode() takes the persisted key_tail and dirty_tail seg_off from
the cache device and addresses within the segment with it. A seg_off at or
past the segment data_size, controllable by whoever supplies the device
(CAP_SYS_ADMIN), reads past the segment data.
Reject a decoded seg_off that is not below the segment data_size.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 7% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Linux · Linux
1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 before ffd9a214a94f9928e54856f42b1cc3e33fb10e36; 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 before 8bf7a06ca3c1611809725f58cfd573f2ffbda75f; 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 before d1898576090a10d2ac2715218a652e78fb65a6b0; 6.18 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-80959
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-80959
git.kernel.org
https://git.kernel.org/stable/c/8bf7a06ca3c1611809725f58cfd573f2ffbda75f
git.kernel.org
https://git.kernel.org/stable/c/d1898576090a10d2ac2715218a652e78fb65a6b0
git.kernel.org
https://git.kernel.org/stable/c/ffd9a214a94f9928e54856f42b1cc3e33fb10e36
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