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

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.