Medium [CVE-2026-80957] Linux kernel: dm-pcache denial of service via forged last-kset chain
This medium-severity Red Hat Linux advisory covers CVE-2026-80957 affecting Red Hat OpenShift Container Platform 4.
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Summary
A flaw was found in the `dm-pcache` component of the Linux kernel. A local attacker could exploit a vulnerability in the `cache_replay()` function, which does not properly handle a forged `last-kset` chain.
By crafting a malicious chain that points back to an already visited segment, an attacker can cause an infinite loop during replay, leading to a Denial of Service (DoS) condition. Red Hat severity: Moderate — CVSS 4.4 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-835. Affected Red Hat products: Red Hat OpenShift Container Platform 4.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 41 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 41 minutes ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 41 minutes ago·verify at source
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