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Vulnerability · Published Oct 13, 2026 · Assigned by redhat

CVE-2026-109976Clevis: clevis: integer underflow in pkcs#11 data socket handler crashes daemon on unbound client connection

Medium 4.7

In plain English

A medium-severity out-of-bounds write in Red Hat Enterprise Linux 10 from Red Hat. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.7Medium
Exploit odds (30 days)0.1%top 96.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12clevisno fix listedDEBIAN-CVE-2026-109976
Debian:13clevisno fix listedDEBIAN-CVE-2026-109976
Debian:14clevis24-1DEBIAN-CVE-2026-109976
Ubuntu:22.04:LTSclevisno fix listedUBUNTU-CVE-2026-109976
Ubuntu:24.04:LTSclevisno fix listedUBUNTU-CVE-2026-109976
Ubuntu:26.04:LTSclevisno fix listedUBUNTU-CVE-2026-109976
Ubuntu:26.10clevisno fix listedUBUNTU-CVE-2026-109976

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 5 see references

Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

References