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Execution with Unnecessary Privileges The advisory has been revoked - it doesn't affect any version of package cifs-utils  (opens in a new tab)

Threat Intelligence

EPSS
0.16% (6th percentile)

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  • Snyk IDSNYK-UBUNTU2510-CIFSUTILS-17376365
  • published3 Jul 2026
  • disclosed18 Jun 2026
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Introduced: 18 Jun 2026

CVE-2026-12505  (opens in a new tab)
CWE-250  (opens in a new tab)

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:25.10.

NVD Description

Note: Versions mentioned in the description apply only to the upstream cifs-utils package and not the cifs-utils package as distributed by Ubuntu.

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.