High [CVE-2026-89650] Linux kernel (Ceph): Out-of-bounds read in client via crafted MDS map
This high-severity Red Hat Linux advisory covers CVE-2026-89650.
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Summary
A flaw was found in the Linux kernel's Ceph client. A malicious or compromised Ceph monitor, or an on-path attacker, can send a specially crafted Metadata Server (MDS) map.
This map, with an oversized num_export_targets field and a per-MDS info version of 2 or 3, can trigger an out-of-bounds read in the client kernel. This could lead to system instability or a denial of service.
Red Hat severity: Moderate — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-125.
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 57 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 57 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 57 minutes ago·verify at source
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