---
id: CVE-2026-109976
title: A flaw was found in the clevis PKCS#11 pin
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.…
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-787
vendor: Red Hat
product: clevis
affected:
  - clevis (all versions)
  - clevis
  - clevis
  - clevis (all versions)
  - openshift/ose-rhel-coreos-8
  - openshift/ose-rhel-coreos-9
published: '2026-10-13'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T16:33:26.290'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109976'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-109976'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2550375'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2550375'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109976.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-109976'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109976'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
epss: 0.00143
epssPercentile: 0.03607
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-14T17:27:03.696951Z'
ingestedAt: '2026-10-13T13:27:04.020Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109976.json)