What is CVE-2026-104038?

CVE-2026-104038 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under NULL Pointer Dereference. CVSS score: 5.9/10. Published 2026-10-06.

How severe is CVE-2026-104038?

Medium severity. CVSS v3 base score is 5.9 out of 10.

NULL pointer dereference in Red Hat Enterprise Linux 10

CVE-2026-104038

A flaw was found in sssd. A remote attacker can cause a denial of service (DoS) by submitting a certificate that lacks an expected Security Identifier (SID) extension. In deployments configured with SID-based certificate mapping rules, the service fails to verify the presence of the extension before processing it, causing the process to crash during authentication or lookup operations.

Published 2026-10-06 · last modified 2026-10-06.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/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-476 — NULL Pointer Dereference

References

access.redhat.com/security/cve/CVE-2026-104038 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)

Frequently asked questions

What is CVE-2026-104038?: CVE-2026-104038 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under NULL Pointer Dereference. CVSS score: 5.9/10. Published 2026-10-06.
How severe is CVE-2026-104038?: Medium severity. CVSS v3 base score is 5.9 out of 10.