Medium [CVE-2026-104042] Sssd: sssd: denial of service via out-of-bounds read in pam responder
This medium-severity Red Hat Linux advisory covers CVE-2026-104042 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
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Summary
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. This vulnerability is rated as having Moderate impact because it requires local host access and is confined to causing a denial of service against the SSSD PAM responder service.
Successful exploitation does not facilitate remote access, privilege escalation, or unauthorized data exposure. While local unprivileged users can interact with the PAM responder socket in standard deployments, the impact remains restricted to service disruption until the responder process is restarted.
Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-125.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4. Will not fix / out of support: Red Hat Enterprise Linux 6.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 41 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 41 minutes ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 41 minutes ago·verify at source
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