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From: Salvatore Bonaccorso <carnil@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: cifs-utils: CVE-2026-12505
Message-ID: <178193417413.3357133.7484183514861943068.reportbug@eldamar.lan>
X-Mailer: reportbug 13.2.0
Date: Sat, 20 Jun 2026 07:42:54 +0200
Delivered-To: submit@bugs.debian.org

Source: cifs-utils
Version: 2:7.4-1
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for cifs-utils.

CVE-2026-12505[0]:
| 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.

If I'm not completely wrong this helped to exploit CVE-2026-46243
without the kernel side fix.

If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-12505
    https://www.cve.org/CVERecord?id=CVE-2026-12505
[1] https://bugzilla.redhat.com/show_bug.cgi?id=2489805
[2] https://git.samba.org/?p=cifs-utils.git;a=commit;h=972c5b5ff95e3e812bc8daa72d0383654ab0dba7

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore
]