Medium [CVE-2026-89543] sunrpc use-after-free leading to Denial of Service
This medium-severity Red Hat Linux advisory covers CVE-2026-89543 affecting Red Hat OpenShift Container Platform 4.
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Summary
A flaw was found in the kernel's sunrpc component. A use-after-free vulnerability can occur due to improper handling of clnt->pipefs_sb pointers during mount and unmount events.
This can lead to stale pointers, which, when accessed, may result in a system crash (Denial of Service). Red Hat severity: Important — CVSS 4.1 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-825. 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 2 hours 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 2 hours 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 2 hours ago·verify at source
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