High [CVE-2026-89714] Linux kernel NFS: Denial of Service due to unbounded memory leak from failed mount attempts
This high-severity Red Hat Linux advisory covers CVE-2026-89714.
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Summary
A flaw was found in the Linux kernel's Network File System (NFS) component. When an NFSv4 mount attempt fails, the nfs4_server_common_setup() function does not properly free a memory allocation for the delegation hash table.
A client that persistently retries a failed mount can exploit this to cause an unbounded kernel memory leak. This can lead to system instability and a Denial of Service (DoS) due to memory exhaustion.
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-772.
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 32 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 32 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 32 minutes ago·verify at source
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