High [CVE-2026-89652] Linux kernel (Ceph): Buffer overflow leads to memory corruption in NFS export
This high-severity Red Hat Linux advisory covers CVE-2026-89652 affecting Red Hat OpenShift Container Platform 4.
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Summary
A flaw was found in the Linux kernel's Ceph file system. A malicious or compromised Ceph Metadata Server (MDS) can send a specially crafted `LOOKUPNAME` reply that causes a buffer overflow when copying dentry names during an NFS export operation.
This out-of-bounds write can lead to memory corruption on the client system, particularly when a CephFS mount is re-exported over NFS. Red Hat severity: Important — CVSS 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/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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