Kernel-level vuln in widely deployed Linux nfsd allowing remote kernel memory corruption via NFS/UDP; affects many servers and can cause DoS or RCE.
CVE-2026-89702
Linux kernel nfsd tracepoint buffer overflow via NFS/UDP causing kernel memory corruption
Is CVE-2026-89702 being exploited?
Not confirmed. CVE-2026-89702 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 0.46% probability of exploitation in the next 30 days.
How severe is CVE-2026-89702?
CVE-2026-89702 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-2026-89702?
Yes. A fix has been recorded for CVE-2026-89702. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-89702 affect?
CVE-2026-89702 affects Linux kernel (nfsd), Servers/NAS running NFSv2/v3 over UDP, Linux-based appliances using nfsd. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-89702?
Apply upstream/stable kernel patches immediately; block NFS/UDP from untrusted networks
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote kernel memory corruption from crafted NFSv2/v3-over-UDP requests; can cause DoS or enable remote code execution/privilege escalation.
Immediate action required
- affected>= 051382885552e12541cc0ebf82092be374a9ed2a and < 95d064f9828a20ccca5ae90a17be3e2076f25272
- affected>= 051382885552e12541cc0ebf82092be374a9ed2a and < 7ff8d6363cffff45654ea85e319f7c0c54226012
- affected>= 051382885552e12541cc0ebf82092be374a9ed2a and < 719a10e3f5f868c3c4ac3cf3648c5775d12034bd
- affected>= 051382885552e12541cc0ebf82092be374a9ed2a and < 71d068490098b1d23c63b2345e40675d3a1ca763
- affecteddcbebc86850324fbe0a993ce352f0539cd98038a
- affected62980365d6e894234b29f44fb2bfad4f7f8bb824
- affected>= 5.15.154 and < 5.16
- affected6.0
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.