CVE-2026-31431: crypto: algif_aead - Revert to operating out-of-place
Overview
- Severity
- Medium (CVSS 5.5)
- CVSS Vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Exploit Status
- Not Exploited
- Patch Tuesday
- 2026-Apr
- Released
- 2026-04-23
- Last Updated
- 2026-05-05
- EPSS Score
- 94.55% (percentile: 99.8%)
Detection & Weaponization (4 sources)
Maturity: Detection
- Metasploit modules: Copy Fail AF_ALG + authencesn Page-Cache Write
- Sigma rules: Linux AF_ALG Socket Creation - Kernel Crypto API Exploit Indicator, Authencesn Crypto Module Load via Modprobe - Copy-Fail Indicator
- YARA rules: expl_copy_fail_cve_2026_31431.yar, SIGNATURE_BASE_EXPL_LNX_Copy_Fail_Artefacts_CVE_2026_31431_Apr26
- GitHub PoC: 63 repositories
Affected Products (4)
Open Source Software
- azl3 kernel 6.6.130.1-3 on Azure Linux 3.0
- azl3 kernel 6.6.134.1-2 on Azure Linux 3.0
- cbl2 kernel 5.15.202.1-1 on CBL Mariner 2.0
Other
Revision History
- 2026-04-23: Information published.
- 2026-04-23: Information published.
- 2026-04-29: Information published.
- 2026-04-30: Information published.
- 2026-05-01: Information published.
- 2026-05-03: Information published.
- 2026-05-04: Information published.
- 2026-05-05: Information published.
- 2026-05-05: Information published.