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).
Published: 2026-10-06
Score: 4.7 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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Advisories

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History

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'}

Subscriptions

Redhat Enterprise Linux Openshift
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

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

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

Link: CVE-2026-104034

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-104034

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-06T01:30:09Z

Weaknesses
  • CWE-825

    Expired Pointer Dereference