PT-2026-50619 · Red Hat · Red Hat Enterprise Linux 10+5

Published 2026-06-18 · Updated 2026-06-18 · CVE-2026-12505

Mitre

CVSS v3.1

7.8

High

Base vector

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

A flaw was found in the cifs-utils package where the cifs.upcall helper fails to securely drop its root privileges before looking up user information inside a user-controlled environment. A local, low privileged attacker can exploit this by using a crafted request key payload to trick the root-owned helper into entering a custom environment (namespace) containing a malicious NSS module. This forces the system to load the attacker's controlled NSS Module and configuration, allowing them to execute arbitrary commands as the root user, elevating their privileges and fully compromising the system.

Fix

Weakness Enumeration

CWE-250

Related Identifiers

CVE-2026-12505

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

Red Hat Openshift Container Platform 4

References · 3

• https://bugzilla.redhat.com/show_bug.cgi?id=2489805 · Note
• https://git.samba.org/?p=cifs-utils.git;a=commit;h=972c5b5ff95e3e812bc8daa72d0383654ab0dba7 · Note
• https://access.redhat.com/security/cve/CVE-2026-12505 · Note