CVE-2026-104034

Summary

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).

Affected Software

Weaknesses

• CWE-825: Expired Pointer Dereference

References

• https://access.redhat.com/security/cve/CVE-2026-104034
• https://bugzilla.redhat.com/show_bug.cgi?id=2479178

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