CVE-2026-12610

Name	CVE-2026-12610
Description	A flaw was found in sssd. When authenticating with a YubiKey, the SSSD PAM responder can crash due to a use-after-free vulnerability, where a memory pointer is incorrectly handled. A local attacker could exploit this flaw by manipulating smartcard or YubiKey contents, leading to a denial of service that disrupts authentication. This vulnerability also presents a potential for privilege escalation, although it is difficult to exploit.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1141323

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
sssd (PTS)	bookworm	2.8.2-4+deb12u1	vulnerable
	trixie	2.10.1-2	vulnerable
	sid	2.13.1-3	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
sssd	source	(unstable)	2.13.1-1			1141323

Notes

[trixie] - sssd <no-dsa> (Minor issue)
[bookworm] - sssd <postponed> (Minor issue)
[bullseye] - sssd <postponed> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=2490288
https://github.com/SSSD/sssd/issues/8796
https://github.com/SSSD/sssd/commit/fa7a55949a30fed064a28ea6f0c801fc5e8c5ba7 (master)
https://github.com/SSSD/sssd/commit/f2c69b916f5fe53a930aa39c2078b248b83bc2b4 (sssd-2-13 branch)
https://github.com/SSSD/sssd/commit/db7ffa3ea6a971bb84bc54558ca7217751724334 (sssd-2-9 branch)