What’s Vulnerable › Vulnerabilities

CVE-2026-80959: dm-pcache: bound the persisted tail-position offset

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-19

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.

Affected products

• Linux kernel: 6.18 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/8bf7a06ca3c1611809725f58cfd573f2ffbda75f
• https://git.kernel.org/stable/c/d1898576090a10d2ac2715218a652e78fb65a6b0
• https://git.kernel.org/stable/c/ffd9a214a94f9928e54856f42b1cc3e33fb10e36

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