CVE-2026-104043

A flaw was found in SSSD. A local attacker with access to the Name Service Switch (NSS) responder UNIX socket can trigger an integer underflow by sending a specially crafted request with an undersized packet header. This issue causes an out-of-bounds memory read during packet parsing, crashing the responder process and resulting in a Denial of Service (DoS).

This vulnerability is rated as Moderate impact because exploitation is constrained to local users with access to the SSSD NSS UNIX domain socket, resulting in a denial of service without compromising confidentiality or integrity. On standard Red Hat Enterprise Linux systems where SSSD is active, any unprivileged local process can interact with the responder socket by default. While crashing the NSS responder interrupts identity and group resolution across the host, the flaw cannot be leveraged for privilege escalation or remote arbitrary code execution.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

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.