A critical vulnerability (CVE-2026-31533, CVSS 9.8) in the Linux kernel allows for system compromise, while a high-severity flaw in the algif_aead module (CVE-2026-31431, CVSS 7.8) enables local privilege escalation or container escape via mishandled in-place cryptographic operations. Affected versions span numerous kernel series, including 5.15.160 to 5.15.203, 6.1.84 to 6.1.169, and 6.6.18 to 6.6.135. Patches are available in fixed versions such as 5.15.203, 6.1.169, and 6.6.135, requiring immediate kernel updates.
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; - Packet sockets; - TLS protocol; (CVE-2026-31504, CVE-2026-31533, CVE-2026-43033, CVE-2026-43077, CVE-2026-43078)