Medium [CVE-2026-89703] Use-after-free in nfsd due to incorrect state handling in nfsd4_drop_revoked_stid
This medium-severity Red Hat Linux advisory covers CVE-2026-89703.
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Summary
A flaw was found in the `nfsd` component of the Linux kernel. The `nfsd4_drop_revoked_stid()` function, which handles admin-revoked delegations, fails to correctly set a status flag before releasing a lock.
This oversight can lead to a use-after-free condition when a freed delegation is incorrectly added to a list, potentially allowing an attacker to cause a denial of service or execute arbitrary code. 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-825.
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 29 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 29 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 29 minutes ago·verify at source
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