CVE-2026-46033

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the authencesn component of the crypto subsystem where the crypto authenc esn create() function fails to validate the auth->digestsize before copying it into inst->alg.maxauthsize. This allows the creation of instances with an invalid default authsize between 1 and 3 bytes when using an ahash with a corresponding digest size, such as cbcmac(cipher null). Consequently, the AF ALG interface can trigger ESN tail handling with an insufficient tag length, leading to an out-of-bounds access.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.