A vulnerability in the Linux kernel algif_aead module (CVE-2026-31431) allows improper handling of in-place cryptographic operations, known as Copy Fail. This flaw enables a local attacker to escalate privileges or potentially escape a container. The issue affects the linux-azure-4.15 kernel and related FIPS variants. Multiple security issues in cryptographic API and packet sockets subsystems were also addressed in the same update. Fixes are available and require system updates and reboot.