CVE-2026-12610: Sssd: use-after-free crash in sssd' 'sssd_pam' process

Severity: medium (CVSS 6.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-30 · updated 2026-08-31
Weakness: CWE-825

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.

Affected products

[UNKNOWN] sssd: all versions
Red Hat Enterprise Linux: 8.0, 9.0, 10.0

References

https://access.redhat.com/security/cve/CVE-2026-12610
https://bugzilla.redhat.com/show_bug.cgi?id=2490288
https://github.com/SSSD/sssd/issues/8796

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