CVE-2026-90995 Sssd: sssd: local denial of service due to null pointer dereference in pam responder
A local attacker can crash the SSSD PAM responder by sending a crafted request when pam_app_services is enabled, disrupting authentication.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90995?
CVE-2026-90995 is a medium-severity vulnerability in Redhat Enterprise Linux, published on 14 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw was found in SSSD (System Security Services Daemon). A local attacker with privileges to connect to the PAM (Pluggable Authentication Modules) responder socket can send a specially crafted protocol request. If the `pam_app_services` configuration is enabled and the service item is omitted from the request, a NULL pointer dereference can occur. This vulnerability leads to a denial of service, causing the PAM responder to crash and disrupt authentication services.
Weakness: CWE-476
Which versions are affected by CVE-2026-90995?
It affects 3 products.
Products include Fedoraproject Sssd, Redhat Enterprise Linux, Redhat Openshift Container Platform.
How do I fix CVE-2026-90995?
Apply the vendor's patch.
Is CVE-2026-90995 being exploited?
There is no known exploitation of CVE-2026-90995 in the wild and no public exploit code.
Other vulnerabilities in Redhat Enterprise Linux
Sources
Also known as DEBIAN-CVE-2026-90995, GHSA-q5vg-f923-829p, UBUNTU-CVE-2026-90995.