What’s Vulnerable › Vulnerabilities

CVE-2026-80957: dm-pcache: detect a cycle in the last-kset chain during replay

• Severity: unknown
• 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: detect a cycle in the last-kset chain during replay cache_replay() follows the on-media last-kset chain by next_cache_seg_id with no cond_resched(). A forged chain that points back into a segment it has already visited makes the replay loop follow it forever. Cap the last-kset hops at cache->n_segs; a valid chain visits each segment at most once.

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/16c3b3a326e70f246a605b3dc27b7f83ba4743e3
• https://git.kernel.org/stable/c/5311dfc5cd70edccd110257e3f30b2c1dcd3768d
• https://git.kernel.org/stable/c/663ee2f3824a505b983162de44134e789f8230da

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