CVE-2026-104042 Sssd: sssd: denial of service via out-of-bounds read in pam responder
A local attacker can crash the SSSD PAM responder by sending a crafted request with a zero-length token, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-104042?
CVE-2026-104042 is a medium-severity denial of service vulnerability in Red Hat Enterprise Linux 10, published on 6 Oct 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. A local attacker can cause a Denial of Service (DoS) by sending a crafted Pluggable Authentication Module (PAM) request containing a zero-length authentication token to the responder socket. Due to missing input validation, the service attempts to read beyond buffer boundaries when processing the token, causing the PAM responder to crash.
Weakness: CWE-125
Which versions are affected by CVE-2026-104042?
How do I fix CVE-2026-104042?
No fix has been published for CVE-2026-104042 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-104042 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104042 exists.
Sources
Also known as DEBIAN-CVE-2026-104042, GHSA-2p66-h37w-3vpg, UBUNTU-CVE-2026-104042.