Bug 2413619 (CVE-2025-40109)

A flaw was found in the Linux kernel’s cryptographic random number generation (RNG) code where the set_ent routine, responsible for incorporating additional entropy, was not guaranteed to be present except in the deterministic random bit generator (DRBG) implementation. This could result in incomplete entropy mixing in non-DRBG RNG paths, weakening randomness used for cryptographic operations. Although exploitation requires local access and does not directly lead to privilege escalation, inadequate randomness can compromise cryptographic strength and potentially lead to system instability or weakened security guarantees