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.

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Fixes

Solution

No solution given by the vendor.


Workaround

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.

History

Tue, 15 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Low


Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Sssd: local oob read in nss service request parsers (`sss_nss_protocol_parse_svc_name` / `sss_nss_protocol_parse_svc_port`)
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift
Weaknesses CWE-125
CPEs cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat openshift
References
Metrics cvssV3_1

{'score': 4, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-14T17:02:03.986Z

Reserved: 2026-09-11T22:08:46.106Z

Link: CVE-2026-90463

cve-icon Vulnrichment

Updated: 2026-09-14T16:45:07.764Z

cve-icon NVD

Status : Received

Published: 2026-09-14T16:17:23.400

Modified: 2026-09-14T17:17:54.060

Link: CVE-2026-90463

cve-icon Redhat

Severity : Low

Publid Date: 2026-09-14T13:53:00Z

Links: CVE-2026-90463 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-15T13:30:13Z

Weaknesses