Copyright © 2012 Red Hat, Inc. All rights reserved. Low 2026-09-14T13:53:00 sssd: Local OOB Read in NSS Service Request Parsers (`sss_nss_protocol_parse_svc_name` / `sss_nss_protocol_parse_svc_port`) 4.0 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CWE-125

A flaw was found in the sssd NSS responder. This input validation vulnerability allows a local attacker, by sending specially crafted service lookup requests to the NSS responder's UNIX socket, to cause an out-of-bounds read. This out-of-bounds read may lead to a denial of service (DoS) by crashing the NSS responder process. While unprivileged local clients can typically reach the socket, there is no evidence of privilege escalation or reliable data disclosure.

A flaw was found in the sssd NSS responder. This input validation vulnerability allows a local attacker, by sending specially crafted service lookup requests to the NSS responder's UNIX socket, to cause an out-of-bounds read. This out-of-bounds read may lead to a denial of service (DoS) by crashing the NSS responder process. While unprivileged local clients can typically reach the socket, there is no evidence of privilege escalation or reliable data disclosure.

This vulnerability has a Low impact as it is a local-only parser bug in the SSSD NSS responder. Exploitation requires a local process to connect to the NSS responder UNIX socket, which can lead to an out-of-bounds read and potentially a denial of service. There is no evidence of privilege escalation or reliable data disclosure. This issue was discovered by Found by AISLE in partnership with Red Hat. To reduce exposure, restrict access to the SSSD NSS responder UNIX socket (`/var/lib/sss/pipes/nss`) to trusted local clients. This can be achieved by enforcing stricter socket permissions or explicit UID restrictions. While this reduces the attack surface, the underlying parser bug remains. Changes to socket permissions may require a restart of the SSSD service to take effect. Red Hat Enterprise Linux 10 Fix deferred sssd Red Hat Enterprise Linux 6 Out of support scope sssd Red Hat Enterprise Linux 7 Fix deferred sssd Red Hat Enterprise Linux 8 Fix deferred sssd Red Hat Enterprise Linux 9 Fix deferred sssd Red Hat OpenShift Container Platform 4 Fix deferred openshift/ose-rhel-coreos-8 Red Hat OpenShift Container Platform 4 Fix deferred openshift/ose-rhel-coreos-9 https://www.cve.org/CVERecord?id=CVE-2026-90463 https://nvd.nist.gov/vuln/detail/CVE-2026-90463