{"id":"CVE-2026-109976","aliases":["DEBIAN-CVE-2026-109976","EUVD-2026-98481","GHSA-vqch-3qxf-26cw","UBUNTU-CVE-2026-109976"],"status":"published","title":"Clevis: clevis: integer underflow in pkcs#11 data socket handler crashes daemon on unbound client connection","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.","severity":{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00143,"percentile":0.037,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-787"],"published":"2026-10-13T12:17:05Z","modified":"2026-11-06T17:50:35Z","fixes":[{"ecosystem":"Debian:14","package":"clevis","fixed_in":["24-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"clevis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["19-2","19-3","19-4","19-5","19-6","20-1","22-1","23-1","24-1"]},{"source":"osv","ecosystem":"Debian:13","package":"clevis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20-1","22-1","23-1","24-1"]},{"source":"osv","ecosystem":"Debian:14","package":"clevis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"24-1"}]}],"versions":["20-1","22-1","23-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"clevis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8-1","8-1ubuntu0.1","8-1ubuntu0.2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"clevis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["11-2","12-1ubuntu1","12-1ubuntu2","12-1ubuntu2.1","12-1ubuntu2.2","12-1ubuntu2.3"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"clevis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["16-2","18-1","18-1ubuntu1","18-1ubuntu1.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"clevis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["19-3","19-6","19-6build1","19-6build2","20-1","20-1ubuntu0.24.04.1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"clevis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20-1ubuntu2","23-1","23-1build1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"clevis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20-1","20-1build1","20-1ubuntu1","20-1ubuntu2"]}],"products":[{"vendor":"red hat","product":"red hat enterprise linux 10"},{"vendor":"red hat","product":"red hat enterprise linux 7"},{"vendor":"red hat","product":"red hat enterprise linux 8"},{"vendor":"red hat","product":"red hat enterprise linux 9"},{"vendor":"red hat","product":"red hat openshift container platform 4"},{"vendor":"red hat","product":"red hat openshift container platform 5"}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-109976","tags":["vdb-entry","x_refsource_REDHAT","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2550375","tags":["issue-tracking","x_refsource_REDHAT","exploit","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109976"},{"url":"https://github.com/advisories/GHSA-vqch-3qxf-26cw"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-109976","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-109976","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-109976","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-109976","title":"Clevis: clevis: integer underflow in pkcs#11 data socket handler crashes daemon on unbound client connection","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.","status":"published","published":"2026-10-13T12:17:05.981Z","modified":"2026-11-06T17:50:35.228Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-787"],"updated_at":"2026-11-06T18:59:07.714367Z"}],"euvd":[{"id":"EUVD-2026-98481","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.","status":"published","published":"2026-10-13T12:17:05Z","modified":"2026-11-06T17:50:35Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-06T19:05:53.354277Z"}],"ghsa":[{"id":"GHSA-vqch-3qxf-26cw","title":"A flaw was found in the clevis PKCS#11 pin. The clevis-pkcs11-afunix-socket-unlock daemon crashes...","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.","status":"published","published":"2026-10-13T15:32:19Z","modified":"2026-10-13T15:32:26Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:13:10.715475Z"}],"nvd":[{"id":"CVE-2026-109976","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.","status":"published","published":"2026-10-13T13:17:29.563Z","modified":"2026-11-06T18:17:43.637Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-06T20:01:13.883836Z"}],"osv":[{"id":"DEBIAN-CVE-2026-109976","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.","status":"published","published":"2026-10-13T13:17:29.563Z","modified":"2026-11-07T09:47:24.251012116Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-07T10:14:39.995311Z"},{"id":"UBUNTU-CVE-2026-109976","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.","status":"published","published":"2026-10-13T13:17:00Z","modified":"2026-10-17T12:59:51.903674707Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T16:55:59.591851Z"}]}}