A flaw was found in sssd. A local unprivileged user could send a specially crafted request with a zero-length body to the Network Security Services (NSS) responder. This could lead to a denial-of-service condition, causing the NSS responder to become unstable or terminate. This vulnerability affects the availability of the system responder.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

To mitigate this issue, restrict access to the NSS responder UNIX socket or disable the NSS responder if it is not required. The NSS responder can be disabled by editing the `/etc/sssd/sssd.conf` file and removing `nss` from the `services` line in the `[sssd]` section. After modifying the configuration, restart the SSSD service for the changes to take effect. Disabling the NSS responder may impact local user and group resolution. Example: ```bash # Remove 'nss' from the services line in /etc/sssd/sssd.conf # Before: services = nss, pam, autofs # After: services = pam, autofs sudo systemctl restart sssd ``` Warning: Restarting the `sssd` service will temporarily interrupt authentication and authorization services.

History

Wed, 16 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


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

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


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

Type Values Removed Values Added
Description A flaw was found in sssd. A local unprivileged user could send a specially crafted request with a zero-length body to the Network Security Services (NSS) responder. This could lead to a denial-of-service condition, causing the NSS responder to become unstable or terminate. This vulnerability affects the availability of the system responder.
Title Sssd: sssd: denial of service in nss responder via crafted zero-length requests
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift
Weaknesses CWE-191
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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-16T15:15:29.002Z

Reserved: 2026-09-14T14:46:11.065Z

Link: CVE-2026-90996

cve-icon Vulnrichment

Updated: 2026-09-16T15:15:23.111Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-14T16:17:42.517

Modified: 2026-09-16T19:42:43.623

Link: CVE-2026-90996

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-14T14:50:00Z

Links: CVE-2026-90996 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-15T13:15:18Z

Weaknesses