DEBIAN-CVE-2026-15779

Advisory lineage Upstream: 1 Downstream: 0
Upstream
CVE-2026-15779
Published: 15 Jul 2026, 13:17
Last modified:20 Jul 2026, 09:00

Vulnerability Summary

Overall Risk (default)
low
24/100
CVSS Score
6.1 MEDIUM
3.1 (osv_debian)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

15 Jul 2026, 13:17
Published
Vulnerability first disclosed
20 Jul 2026, 09:00
Last Modified
Vulnerability information updated

Description

A flaw was found in samba's pam_winbind. When mkhomedir is enabled, pam_winbind chowns the target account's home directory without validating the path is not a critical system directory such as /. On affected systems, accounts with / as their home directory (a common default for system accounts) can have this triggered not only by root, but by a non-root user holding a narrow sudo delegation to run commands as that account, causing ownership of / to change and resulting in severe denial of service (SSH, sudo, and package-manager failures). The change does not grant write access to / (which ships with restrictive 0555 permissions on RHEL), so the impact is availability loss rather than further privilege escalation.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

Affected Systems

  • debian•samba

    all | all | all | all

References (1)