PT-2026-60163 · Red Hat · Red Hat Enterprise Linux 10+4

Runar Lundgren · Published 2026-07-15 · Updated 2026-07-15 · CVE-2026-15779

NVD

CVSS v3.1

6.1

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

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.

Fix

Incorrect Permission

Weakness Enumeration

CWE-732

Related Identifiers

CVE-2026-15779

Affected Products

Red Hat Enterprise Linux 10

Red Hat Enterprise Linux 6

Red Hat Enterprise Linux 7

Red Hat Enterprise Linux 8

Red Hat Enterprise Linux 9

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-15779 · Security Note
• https://gitlab.com/samba-team/samba/-/blob/samba-4.24.3/nsswitch/pam_winbind.c#L1590 · Note
• https://gitlab.com/samba-team/samba/-/blob/samba-4.23.5/nsswitch/pam_winbind.c#L1622 · Note
• https://gitlab.com/samba-team/samba/-/blob/samba-4.19.4/nsswitch/pam_winbind.c · Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2499991 · Note
• https://access.redhat.com/security/cve/CVE-2026-15779 · Note