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

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-13 · updated 2026-10-30
Weakness: CWE-787

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 products

Red Hat Enterprise Linux 10: all versions
Red Hat Enterprise Linux 9: all versions

References

https://access.redhat.com/security/cve/CVE-2026-109976
https://bugzilla.redhat.com/show_bug.cgi?id=2550375
https://bugzilla.redhat.com/show_bug.cgi?id=2550375

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