CVE-2026-89098Hinoki check available

Daemon crash via missing-argument assertions

Published Oct 16, 2026 · Updated Oct 16, 2026

Assertion failure in nfs-utils fsidd allows local users to crash filesystem identifier lookup services via malformed socket requests. The client_cb handler validates required command arguments with assertions instead of rejecting missing arguments, terminating the daemon when an assertion fails. Exploitation requires access to a running affected daemon's local domain socket; filesystem identifier lookup remains unavailable until the daemon restarts.

CVSS severityUnavailable
Unscored
EPSS probability0.10%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Assertion failure in nfs-utils fsidd allows local users to crash filesystem identifier lookup services via malformed socket requests. The client_cb handler validates required command arguments with assertions instead of rejecting missing arguments, terminating the daemon when an assertion fails. Exploitation requires access to a running affected daemon's local domain socket; filesystem identifier lookup remains unavailable until the daemon restarts.

The record

CVE
CVE-2026-89098
Published
Oct 16, 2026
Updated
Oct 16, 2026
Vendor
libuser Project
Product
Red Hat OpenShift Container Platform 4
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

libuser Project · Red Hat OpenShift Container Platform 4Affected versions are unavailable in this record.
libuser Project · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
libuser Project · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.
libuser Project · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
libuser Project · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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