Kernel-level use-after-free in widely deployed Linux lockd (NLM/NFS). Can crash or allow kernel compromise on many servers/clients; public kernel patches exist. Enterprise-wide impact.
CVE-2026-89485
Linux kernel lockd use-after-free can crash or enable kernel compromise via NFS
Is CVE-2026-89485 being exploited?
Not confirmed. CVE-2026-89485 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.70% probability of exploitation in the next 30 days.
How severe is CVE-2026-89485?
CVE-2026-89485 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-89485?
Yes. A fix has been recorded for CVE-2026-89485. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-89485 affect?
CVE-2026-89485 affects Linux kernel (lockd/NLM), NFS servers and clients using lockd, Linux distributions with unpatched kernels. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-89485?
Install vendor kernel updates or apply upstream patch immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Use-after-free in lockd (NLM) can be triggered via NFS or locally to cause kernel crash (DoS) or potentially escalate to kernel code execution.
Immediate action required
- affected>= 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 and < c24bdb7df2f34bdc38ca8a73796f5acb40f1830c
- affected>= 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 and < 41f0a6d31615fcae261bf28a0aa50050dc93a401
- affected>= 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 and < e999a88133654c6dfc68487fb49da5f20dfa2d4f
- affected>= 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 and < 526c49cff3f72c3ec74752016380c7567040581b
- affected2.6.18
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.