A local privilege escalation vulnerability (CVE-2026-31431, CVSS 7.8 HIGH) in the Linux kernel's algif_aead module, known as Copy Fail, allows an attacker to exploit improper in-place cryptographic operations to gain elevated privileges or escape a container. Affected versions include kernel series 5.10 through 6.7, specifically from 4.14 to less than 5.10.254, 5.11 to less than 5.15.204, 5.16 to less than 6.1.170, 6.2 to less than 6.6.137, and 6.7 to less than 6.12.85. The flaw is patched in kernel versions 5.10.254, 5.15.204, 6.1.170, 6.6.137, 6.12.85, and subsequent major releases.
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; - SMB network file system; - Netfilter; - io_uring subsystem; - Packet sockets; - TLS protocol; (CVE-2024-35862, CVE-2024-50060, CVE-2026-23274, CVE-2026-23351, CVE-2026-31419, CVE-2026-31504, CVE-2026-31533, CVE-2026-43033, CVE-2026-43077, CVE-2026-43078)