CVE-2026-90995: fedoraproject sssd NULL Pointer Dereference
Vulnerability summary
CVE-2026-90995 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in fedoraproject sssd. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 2.7% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 14-09-2026PublishedVulnerability first disclosed.
- 15-09-2026Last modifiedVulnerability information updated.
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 metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.14%
Chance of exploitation in the next 30 days
Percentile
3%
Versus all other CVEs
30-day change
+0.03 pp
From 0.11% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (bugzilla.redhat.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Redhat2 products
- enterprise_linuxEOL7.0 | 8.0 | 9.0 | 10.0
- openshift_container_platform4.0
Debian1 product
- sssdAll versions (No fix recorded)
Fedoraproject1 product
- sssd2.12.0
Ubuntu1 product
- sssdAll versions (No fix recorded)
4 vendors · 5 products
References
5 links- bugzilla.redhat.com/show_bug.cgi?id=2479464Issue TrackingX Refsource REDHATREPORTExploitMitigationVendor Advisory
