Medium [CVE-2026-104030] Sssd: sssd: denial of service via out-of-bounds read during passkey parsing
This medium-severity Red Hat Linux advisory covers CVE-2026-104030 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. This vulnerability allows a local user to cause a Denial of Service (DoS) by submitting a specially crafted passkey authentication token that lacks null terminators.
The authentication service reads past the end of the provided memory buffer, causing the process to crash and disrupting authentication services.
Red Hat has rated this vulnerability as Moderate because it enables a local attacker to cause a denial of service in the SSSD PAM responder, interrupting authentication services without allowing privilege escalation or code execution.
In standard Red Hat Enterprise Linux deployments, the PAM responder socket is accessible to local unprivileged processes to facilitate user authentication. Although exploitation requires local system access to submit malformed authentication requests, the resulting service termination affects system availability.
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 7 hours 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 7 hours 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 7 hours ago·verify at source
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