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[USN-8718-1] SSSD vulnerability

Posted on 03 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8718-1
September 03, 2026

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

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 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 validate authentication token
lengths when processing PAM responder requests. A local attacker could
possibly use this issue to cause SSSD 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-common 2.12.0-1ubuntu5.4

Ubuntu 24.04 LTS
sssd-common 2.9.4-1.1ubuntu6.8

Ubuntu 22.04 LTS
sssd-common 2.6.3-1ubuntu3.9

Ubuntu 20.04 LTS
sssd-common 2.2.3-3ubuntu0.13+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
sssd-common 1.16.1-1ubuntu1.8+esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
sssd-common 1.13.4-1ubuntu1.15+esm1
Available with Ubuntu Pro

After a standard system update you need to restart sssd to make all the
necessary changes.

References:
https://ubuntu.com/security/notices/USN-8718-1
CVE-2026-68743

Package Information:
https://launchpad.net/ubuntu/+source/sssd/2.12.0-1ubuntu5.4
https://launchpad.net/ubuntu/+source/sssd/2.9.4-1.1ubuntu6.8
https://launchpad.net/ubuntu/+source/sssd/2.6.3-1ubuntu3.9

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