Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process.

Related CVEs

CVE-2018-16841

Key Information

GHSA ID

GHSA-q3v8-mj9m-2wq4

Published

May 13, 2022 1:34 AM

Last Modified

May 13, 2022 1:34 AM

CVSS Score

5.0 /10

Primary Ecosystem

Unknown

Primary Package

Unknown

GitHub Reviewed

✗ No

Dataset

Last updated: July 28, 2025 6:37 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.