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Vulnerability record · CVE-2026-90995 · published 14 September 2026

CVE-2026-90995: Fedoraproject sssd null pointer dereference vulnerability

Fedoraproject · Sssd

A flaw was found in SSSD (System Security Services Daemon). A local attacker with privileges to connect to the PAM (Pluggable Authentication Modules) responder socket can send a specially crafted protocol request. If the `pam_app_services` configuration is enabled and the service item is omitted from the request, a NULL pointer dereference can occur. This vulnerability leads to a denial of service, causing the PAM responder to crash and disrupt authentication services.

5.5 CVSS 3.1 Medium EPSS 0.14% · top 96.9% CWE-476 · NULL pointer dereference
5.5CVSS 3.1 base score
0.14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
2References, 1 tagged exploit
6 Nov 2026Last modified by NVD

Description

A flaw was found in SSSD (System Security Services Daemon). A local attacker with privileges to connect to the PAM (Pluggable Authentication Modules) responder socket can send a specially crafted protocol request. If the `pam_app_services` configuration is enabled and the service item is omitted from the request, a NULL pointer dereference can occur. This vulnerability leads to a denial of service, causing the PAM responder to crash and disrupt authentication services.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/security/cve/CVE-2026-90995 MitigationVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2479464 ExploitIssue TrackingMitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-90995), CISA KEV, FIRST EPSS (scores of 2026-11-13). This page is refreshed as NVD updates the record.