CVE-2026-109976
Clevis: clevis: integer underflow in pkcs#11 data socket handler crashes daemon on unbound client connection
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Clevis: clevis: integer underflow in pkcs#11 data socket handler crashes daemon on unbound client connection
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.
- Record
CVE-2026-109976- CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-787
- Updated
- 2026-11-06
EUVDEUVD-2026-98481
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.
- Record
EUVD-2026-98481- CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-06
GitHub AdvisoriesGHSA-vqch-3qxf-26cw
A flaw was found in the clevis PKCS#11 pin. The clevis-pkcs11-afunix-socket-unlock daemon crashes...
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.
- Record
GHSA-vqch-3qxf-26cw- CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-787
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-109976- CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-787
- Updated
- 2026-11-06
OSVDEBIAN-CVE-2026-109976
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.
- Record
DEBIAN-CVE-2026-109976- CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-07
OSVUBUNTU-CVE-2026-109976
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.
- Record
UBUNTU-CVE-2026-109976- CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
clevisDebian:12 |
All versions, plus listed versions 19-219-319-419-519-6 Show 4 moreShow less20-122-123-124-1 |
None known |
clevisDebian:13 |
All versions, plus listed versions 20-122-123-124-1 |
None known |
clevisDebian:14 |
before 24-1, plus listed versions 20-122-123-1 |
24-1 |
clevisUbuntu:18.04:LTS |
All versions, plus listed versions 8-18-1ubuntu0.18-1ubuntu0.2 |
None known |
clevisUbuntu:20.04:LTS |
All versions, plus listed versions 11-212-1ubuntu112-1ubuntu212-1ubuntu2.112-1ubuntu2.212-1ubuntu2.3 |
None known |
clevisUbuntu:22.04:LTS |
All versions, plus listed versions 16-218-118-1ubuntu118-1ubuntu1.1 |
None known |
clevisUbuntu:24.04:LTS |
All versions, plus listed versions 19-319-619-6build119-6build220-120-1ubuntu0.24.04.1 |
None known |
clevisUbuntu:26.10 |
All versions, plus listed versions 20-1ubuntu223-123-1build1 |
None known |
clevisUbuntu:26.04:LTS |
All versions, plus listed versions 20-120-1build120-1ubuntu120-1ubuntu2 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | CVE List | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-109976 is a medium vulnerability (CVSS 4.7) in Red Hat Enterprise Linux 10, published October 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.14%, the 3rd percentile. Fixed in clevis 24-1.