[Pkg-sssd-devel] Bug#1141323: sssd: CVE-2026-12610: use-after-free during p11_child processing

[Salvatore Bonaccorso]

Source: sssd
Version: 2.10.1-2
Severity: important
Tags: security upstream
Forwarded: https://github.com/SSSD/sssd/issues/8796
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for sssd.

CVE-2026-12610[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-12610
    https://www.cve.org/CVERecord?id=CVE-2026-12610
[1] https://github.com/SSSD/sssd/issues/8796
[2] 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)   

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore