Incorrect permission assignment for critical resource in Samba - CVE-2026-15779
Published: July 21, 2026 / Updated: July 29, 2026
Vulnerability identifier: #VU139974
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-15779
CWE-ID: CWE-732
Exploitation vector: Local access
Exploit availability:
No public exploit available
Affected software:
Samba
Samba
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to incorrect permission assignment for critical resource in the mkhomedir process in pam_winbind when opening a PAM session for an account whose home directory resolves to / or another sensitive system path. A local user can initiate a PAM session for such an account to cause a denial of service.
This is only exploitable when mkhomedir is explicitly enabled in pam_winbind.conf.
How to mitigate CVE-2026-15779
Install security update from vendor's website.