Medium [CVE-2026-89709] Linux kernel: lockd and nfsd denial of service vulnerability
This medium-severity Red Hat Linux advisory covers CVE-2026-89709.
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Summary
A flaw was found in the Linux kernel's lockd and nfsd components. An unguarded dereference of nlmsvc_ops after the nfsd module is removed can lead to a NULL pointer dereference or a use-after-free condition.
This vulnerability could allow a local attacker to cause a denial of service. Red Hat severity: Important — CVSS 4.4 (CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-476.
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 22 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 22 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 22 minutes ago·verify at source
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