USN-8718-1: SSSD vulnerability

Publication date

3 September 2026

Overview

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


Packages

  • 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.

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
26.04 LTS resolute sssd-common –  2.12.0-1ubuntu5.4
24.04 LTS noble sssd-common –  2.9.4-1.1ubuntu6.8
22.04 LTS jammy sssd-common –  2.6.3-1ubuntu3.9
20.04 LTS focal sssd-common –  2.2.3-3ubuntu0.13+esm1  
18.04 LTS bionic sssd-common –  1.16.1-1ubuntu1.8+esm1  
16.04 LTS xenial sssd-common –  1.13.4-1ubuntu1.15+esm1  

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Have additional questions?

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