A critical flaw (CVE-2026-31431, CVSS 7.8 HIGH) in the Linux kernel's algif_aead module, known as Copy Fail, allows local privilege escalation or container escape via mishandled in-place cryptographic operations. Affected versions include Linux kernel 4.14 through 5.10.253, 5.11 through 5.15.203, 5.16 through 6.1.168, 6.2 through 6.6.131, and 6.7 through 6.12.80. The fix requires upgrading to specific patched versions, such as kernel 5.10.254, 5.15.204, 6.1.170, 6.6.137, 6.12.85, or later as specified per branch.
It was discovered that the Linux kernel algif_aead module did not properly handle in-place cryptographic operations. This flaw is known as Copy Fail. A local attacker could use this to escalate privileges, or possibly escape a container. (CVE-2026-31431) Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - Cryptographic API; - Ethernet bonding driver; - Packet sockets; - TLS protocol; (CVE-2026-31419, CVE-2026-31504, CVE-2026-31533, CVE-2026-43033, CVE-2026-43077, CVE-2026-43078)