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  4. CVE 2026 109976 clevis clevis integer underflow in pkcs11 data
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Back to active CVEs
Medium · CVSS 4.7CVE-2026-109976

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

Answer in brief

CVE-2026-109976 records a Medium severity (CVSS 4.7) vulnerability in Clevis: clevis: integer underflow in pkcs#11 data socket handler crashes daemon on unbound client connection. The current sources do not mark it as known exploited. The current feed maps Red Hat/clevis (generic), Red Hat/openshift/ose-rhel-coreos-8 (generic), Red Hat/openshift/ose-rhel-coreos-9 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 13, 2026Updated Oct 13, 2026Source checked Oct 13, 2026First seen by HOL Oct 13, 2026Material review Oct 13, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.7
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 4.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/clevis (generic), Red Hat/openshift/ose-rhel-coreos-8 (generic), Red Hat/openshift/ose-rhel-coreos-9 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/clevisgeneric*Not reported
Red Hat/openshift/ose-rhel-coreos-8generic*Not reported
Red Hat/openshift/ose-rhel-coreos-9generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/clevis, Red Hat/openshift/ose-rhel-coreos-8, Red Hat/openshift/ose-rhel-coreos-9.
  2. 2Review the reported fix. Source-reported workaround: 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.

Evidence timeline and material changes

  1. Published upstream

    Oct 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 13, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • UEFI OOB Write and Buffer Overflow VulnerabilitiesAlso CWE-787
  • CvFWD Out-of-Bounds WriteAlso CWE-787
  • UEFI OOB Write and Buffer Overflow VulnerabilitiesSame generic ecosystem
  • UEFI OOB Write and Buffer Overflow VulnerabilitiesSame generic ecosystem
  • UEFI OOB Write and Buffer Overflow VulnerabilitiesSame generic ecosystem
  • Uncleared Password Keystrokes VulnerabilitySame generic ecosystem

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-787
Source
CVE List V5
Source checked
Oct 13, 2026
References
2 linked sources
Open source record