CVE-2025-52496

Name	CVE-2025-52496
Description	Mbed TLS before 3.6.4 has a race condition in AESNI detection if certain compiler optimizations occur. An attacker may be able to extract an AES key from a multithreaded program, or perform a GCM forgery.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-4274-1
Debian Bugs	1108785

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
mbedtls (PTS)	bullseye	2.16.9-0.1	vulnerable
	bullseye (security)	2.16.9-0.1+deb11u3	fixed
	bookworm	2.28.3-1	vulnerable
	forky, sid, trixie	3.6.4-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
mbedtls	source	bullseye	2.16.9-0.1+deb11u2		DLA-4274-1
mbedtls	source	(unstable)	3.6.4-1			1108785

https://github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security-advisory-2025-06-1.md