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Fencer Intel
medium 4.7

CVE-2026-109976 json

Clevis: clevis: integer underflow in pkcs#11 data socket handler crashes daemon on unbound client connection

published 27d ago modified 3d ago also EUVD-2026-98481

cvss
4.7
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 the clevis PKCS#11 pin. The clevis-pkcs11-afunix-socket-unlock daemon crashes when an AF_UNIX client connects to the data socket without a bound address, due to an integer underflow in the getpeername result handling. This causes a denial of service, preventing LUKS disk decryption from completing during boot.

Patch / fix

  • clevis Debian 14 24-1

debian advisories DEBIAN-CVE-2026-109976

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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-2026-109976 updated cvss 4.7

clevis: clevis: integer underflow in PKCS#11 data socket handler crashes daemon on unbound client connection

  • Red Hat Enterprise Linux 9 clevis-luks, clevis-dracut, clevis-systemd, clevis-udisks2, clevis 23-2.el10, clevis-pin-pkcs11 Red Hat Enterprise Linux 10 clevis 23-2.el10
    affected: workaround, no fix available “No additional end-user mitigation is needed. Under the default systemd configuration, the data socket is only accessible by root, preventing unprivileged users from triggering the crash.”
  • Red Hat Enterprise Linux 7 clevis-luks, clevis-dracut, clevis-systemd, clevis-udisks2, clevis 23-2.el10 Red Hat Enterprise Linux 8 clevis-luks, clevis-dracut, clevis-systemd, clevis-udisks2, clevis 23-2.el10 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
    not affected: vulnerable code not present

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
26d ago

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2550375 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 4.7 CVSS:3.1/AV:L/AC:H/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 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 Intel 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.