A flaw was found in SSSD. A use-after-free vulnerability exists in the Kerberos Credential Manager (KCM) responder during Kerberos ticket-granting ticket (TGT) renewal, where a deferred callback accesses memory that has already been released. An authenticated local user with a renewable Kerberos ticket can trigger this issue on systems configured with KCM renewal, causing the KCM responder service to crash and resulting in a Denial of Service (DoS).
History

Tue, 06 Oct 2026 21:15:00 +0000

Type Values Removed Values Added
First Time appeared Redhat openshift Container Platform
Sssd
Sssd sssd
Vendors & Products Redhat openshift Container Platform
Sssd
Sssd sssd

Tue, 06 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Tue, 06 Oct 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Tue, 06 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
Description A flaw was found in SSSD. A use-after-free vulnerability exists in the Kerberos Credential Manager (KCM) responder during Kerberos ticket-granting ticket (TGT) renewal, where a deferred callback accesses memory that has already been released. An authenticated local user with a renewable Kerberos ticket can trigger this issue on systems configured with KCM renewal, causing the KCM responder service to crash and resulting in a Denial of Service (DoS).
Title Sssd: sssd: denial of service via use-after-free in kcm ticket renewal
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift
Weaknesses CWE-825
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': 4.7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2026-10-06T00:12:17.976Z

Updated: 2026-10-16T10:57:33.096Z

Reserved: 2026-10-01T17:21:33.512Z

Link: CVE-2026-104034

cve-icon Vulnrichment

Updated: 2026-10-06T14:43:42.755Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-06T01:16:34.273

Modified: 2026-10-06T15:17:11.980

Link: CVE-2026-104034

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-05T23:29:37Z

Links: CVE-2026-104034 - Bugzilla