CVE-2026-90463
Received Received - Intake

Out-of-Bounds Read in SSSD NSS Responder

Publication date: 2026-09-14

Last updated on: 2026-09-14

Assigner: redhat-SADP

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.

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Meta Information

Published
2026-09-14
Last Modified
2026-09-14
Generated
2026-09-15
AI Q&A
2026-09-14
EPSS Evaluated
N/A
NVD
CVE-2026-90463
EUVD
EUVD-2026-77592

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
redhat sssd *
red_hat sssd 2.12.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-125 The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

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Executive Summary

CVE-2026-90463 is a flaw in the SSSD NSS responder component. It involves an out-of-bounds read vulnerability where malformed service lookup requests sent to the NSS responder's UNIX socket cause the parser to read beyond the declared packet length. This can crash the NSS responder process, leading to a denial of service (DoS). The vulnerability does not allow privilege escalation or reliable data disclosure.

Detection Guidance

To detect this vulnerability, monitor the SSSD NSS responder process for crashes or unexpected terminations. Check logs for errors related to service lookup requests or socket access. Use commands like 'journalctl -u sssd-nss' to review logs for crashes or malformed requests. Ensure the UNIX socket for the NSS responder is only accessible to trusted processes.

Impact Analysis

This vulnerability can impact you by causing the SSSD NSS responder to crash, resulting in a denial of service. If an attacker sends crafted requests to the UNIX socket, the service may become unavailable, affecting system operations that rely on SSSD for name or service lookups. The impact is limited to local attacks and does not include data disclosure or privilege escalation.

Compliance Impact

This vulnerability may affect compliance with GDPR or HIPAA by causing service disruptions if the SSSD NSS responder crashes. Downtime in authentication or service resolution could impact systems handling sensitive data. However, since the flaw does not lead to data disclosure or privilege escalation, the primary compliance concern is availability rather than confidentiality or integrity.

Mitigation Strategies

Restrict access to the SSSD NSS responder UNIX socket by modifying its permissions or UID restrictions. Use 'chmod' or 'chown' to limit access to trusted users or processes. After changing permissions, restart the SSSD service with 'systemctl restart sssd'. This prevents unprivileged local clients from sending crafted requests.

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