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Fencer Vulns
medium 5.5

CVE-2026-89098 json

Nfs-utils: nfs-utils: denial of service via assertion failure in fsidd

published 2026-10-16 23 d ago modified 2026-11-06 3 d ago also EUVD-2026-103016

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

A flaw was found in nfs-utils. The fsidd daemon improperly handles input received over its local domain socket by relying on program assertions to verify command arguments. A local user can exploit this vulnerability by sending a malformed request lacking the required arguments to trigger an assertion failure. This causes the daemon to crash, resulting in a Denial of Service (DoS) for filesystem identifier lookup services until restarted.

Patch / fix

  • nfs-utils Debian 14 1:3.1.1-1

debian advisories DEBIAN-CVE-2026-89098

  • nfs-utils Azure Linux 3.0 2.6.4-5

azure linux advisories AZL-109794

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-89098 updated cvss 5.5

nfs-utils: nfs-utils: Denial of Service via assertion failure in fsidd

  • Red Hat Enterprise Linux 6 nfs-utils, nfs-utils 2.8.3-5.el10_2
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 libnfsidmap, nfs-utils 2.8.3-5.el10_2 Red Hat Enterprise Linux 8 nfs-utils, libnfsidmap, nfs-utils 2.8.3-5.el10_2 Red Hat Enterprise Linux 9 nfs-utils, libnfsidmap, nfs-utils-coreos, nfsv4-client-utils, nfs-utils 2.8.3-5.el10_2 Red Hat Enterprise Linux 10 nfs-utils 2.8.3-5.el10_2 Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
20 d ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2469511 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Container Platform 5

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.