High [CVE-2026-89702] Linux kernel: nfsd out-of-bounds write and information disclosure via NFS/UDP requests
This high-severity Red Hat Linux advisory covers CVE-2026-89702.
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Summary
A flaw was found in the Linux kernel's Network File System Daemon (nfsd). When processing NFSv2/v3-over-UDP requests, the `nfsd_fh_verify` and `nfsd_fh_verify_err` tracepoints incorrectly size a memory buffer.
This can lead to an out-of-bounds write, potentially allowing a remote attacker to cause a denial of service or disclose sensitive information from the kernel's ring buffer. Red Hat severity: Important — CVSS 7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H).
Weakness: CWE-787.
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 24 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 24 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 24 minutes ago·verify at source
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