Medium [CVE-2026-89495] Arbitrary code execution and Denial of Service via malformed Distributed Lock Manager messages
This medium-severity Red Hat Linux advisory covers CVE-2026-89495 affecting Red Hat OpenShift Container Platform 4.
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Summary
A flaw was found in ocfs2 in the Linux kernel. A malicious or compromised node within a Distributed Lock Manager (DLM) cluster can send specially crafted messages with unchecked length fields.
This can lead to a heap out-of-bounds write, potentially allowing for arbitrary code execution, or an out-of-bounds read, which can cause a kernel panic and result in a Denial of Service (DoS). Red Hat severity: Important — CVSS 6.4 (CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H).
Weakness: CWE-120. 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 1 hour 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 1 hour 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 1 hour ago·verify at source
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