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[USN-8355-1] SSSD vulnerability

Posted on 01 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8355-1
June 01, 2026

sssd vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS

Summary:

SSSD could be made to crash if it received specially crafted input.

Software Description:
- sssd: System Security Services Daemon

Details:

It was discovered that SSSD did not properly handle raw bytes in the PAM
passkey responder. A local attacker could possibly use this issue to cause
the SSSD PAM responder to crash, resulting in a denial of service.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
sssd 2.12.0-1ubuntu5.1

Ubuntu 25.10
sssd 2.10.1-2ubuntu5.2

Ubuntu 24.04 LTS
sssd 2.9.4-1.1ubuntu6.5

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8355-1
CVE-2026-6245

Package Information:
https://launchpad.net/ubuntu/+source/sssd/2.12.0-1ubuntu5.1
https://launchpad.net/ubuntu/+source/sssd/2.10.1-2ubuntu5.2
https://launchpad.net/ubuntu/+source/sssd/2.9.4-1.1ubuntu6.5

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