In the Linux kernel, the following vulnerability has been resolved: dm-pcache: detect a cycle in the last-kset chain during replay cache_replay()… (CVE-2026-80957)
A vulnerability in the Linux kernel's dm-pcache component allowed a crafted last-kset chain to create an infinite loop during cache replay. This was due to the replay function following the chain without a condition to reschedule, enabling a cycle in the chain to cause endless traversal. The issue has been resolved by limiting the number of hops to the number of segments, ensuring each segment is visited at most once.
AI Analysis
Technical Summary
The Linux kernel's dm-pcache replay function cache_replay() followed the on-media last-kset chain by next_cache_seg_id without a cond_resched() call. A maliciously crafted chain that loops back to a previously visited segment could cause the replay loop to run indefinitely. The fix caps the last-kset hops at cache->n_segs, preventing cycles by ensuring each segment is visited only once.
Potential Impact
An attacker able to supply a forged last-kset chain could cause the kernel replay function to enter an infinite loop, potentially leading to denial of service by exhausting CPU resources. No information about privilege escalation or other impacts is provided.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to cap the last-kset hops during replay, preventing infinite loops caused by cyclic chains. Users should apply the official kernel update that includes this fix. Patch status is not explicitly stated; check the vendor advisory or Linux kernel release notes for the specific fixed version.
In the Linux kernel, the following vulnerability has been resolved: dm-pcache: detect a cycle in the last-kset chain during replay cache_replay()… (CVE-2026-80957)
Description
A vulnerability in the Linux kernel's dm-pcache component allowed a crafted last-kset chain to create an infinite loop during cache replay. This was due to the replay function following the chain without a condition to reschedule, enabling a cycle in the chain to cause endless traversal. The issue has been resolved by limiting the number of hops to the number of segments, ensuring each segment is visited at most once.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's dm-pcache replay function cache_replay() followed the on-media last-kset chain by next_cache_seg_id without a cond_resched() call. A maliciously crafted chain that loops back to a previously visited segment could cause the replay loop to run indefinitely. The fix caps the last-kset hops at cache->n_segs, preventing cycles by ensuring each segment is visited only once.
Potential Impact
An attacker able to supply a forged last-kset chain could cause the kernel replay function to enter an infinite loop, potentially leading to denial of service by exhausting CPU resources. No information about privilege escalation or other impacts is provided.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to cap the last-kset hops during replay, preventing infinite loops caused by cyclic chains. Users should apply the official kernel update that includes this fix. Patch status is not explicitly stated; check the vendor advisory or Linux kernel release notes for the specific fixed version.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-p2v2-4gmp-9rph
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-80957"]
Threat ID: 6aa4a02e55bf5e2cf5a86b68
Added to database: 09/12/2026, 00:43:26 UTC
Last enriched: 09/12/2026, 01:24:41 UTC
Last updated: 09/12/2026, 02:41:28 UTC
Views: 3
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