Medium [CVE-2026-89494] Arbitrary Code Execution via DLM migration message handling
This medium-severity Red Hat Linux advisory covers CVE-2026-89494 affecting Red Hat OpenShift Container Platform 4.
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Summary
A flaw was found in ocfs2, a component of the Linux kernel. A remote attacker, by sending a specially crafted Distributed Lock Manager (DLM) migration message, could exploit a lack of validation in the `dlm_mig_lockres_handler`.
This flaw allows for an out-of-bounds write to the heap, potentially leading to arbitrary code execution. Additionally, an out-of-bounds read could cause a system panic, resulting in a denial of service.
Red Hat severity: Important — CVSS 6.6 (CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-787.
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 58 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 58 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 58 minutes ago·verify at source
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