What is CVE-2026-104034?

CVE-2026-104034 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under CWE-825. CVSS score: 4.7/10. Published 2026-10-06.

How severe is CVE-2026-104034?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Vulnerability in Red Hat Enterprise Linux 10

CVE-2026-104034

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 · last modified 2026-10-06.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-825

References

access.redhat.com/security/cve/CVE-2026-104034 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)

Frequently asked questions

What is CVE-2026-104034?: CVE-2026-104034 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under CWE-825. CVSS score: 4.7/10. Published 2026-10-06.
How severe is CVE-2026-104034?: Medium severity. CVSS v3 base score is 4.7 out of 10.