Description
A flaw was found in SSSD. A local user can cause a denial of service (DoS) by disrupting system authentication services. When handling Generic Security Services Application Programming Interface (GSSAPI) authentication in the Pluggable Authentication Module (PAM) responder, cached connection state is freed upon completion without clearing the reference pointer. An attacker can exploit this by sending an additional request over the same connection, causing the service to access invalid memory and unexpectedly terminate.
Affected products
fedoraproject: sssd; redhat: openshift container platform; redhat: enterprise linux
References2
- access.redhat.com/security/cve/CVE-2026-104039 Vendor Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2478956 ExploitIssue TrackingMitigationVendor Advisory
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 3 · as of 10 November 2026
- CWE
- CWE-825
Could this be exploited in your environment?
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