Local Privilege Escalation Vulnerability in cifs-utils Package

cifs-utils Updated 23 Jul 2026

Summary

23/07/2026

Disclosed on

N/A

Severity

Yes i

Fix available

High

Severity

7.8

CVSS Score

RLSA-2026:39575: Important: cifs-utils security, bug fix, and enhancement update. Affects cifs-utils versions < 0:7.0-5.el8_10. Fixed in 0:7.0-5.el8_10. How to fix ↓

Free scan

Check if this vulnerability affects your application

Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.

Check my app free

No signup required · Results in about 60 seconds

Upload your dependency manifest or SBOM

Drag & drop your file here or Browse

Java Javascript PHP Python Go Rust Ruby Dart C/C++ Elixir CycloneDX SPDX

Upload a supported dependency manifest or SBOM. No installation or source-code access required.

See supported files and SBOM formats

SBOM sbom.json · bom.json · bom.xml · *.spdx.json · *.cdx.json · *.cdx.xml

Java pom.xml · gradle.lockfile · buildscript-gradle.lockfile

Javascript package-lock.json · yarn.lock · pnpm-lock.yaml

PHP composer.lock

Python poetry.lock · requirements.txt · Pipfile.lock

Go go.mod

Rust Cargo.lock

Ruby Gemfile.lock

Dart pubspec.lock

C/C++ conan.lock

Elixir mix.lock

Enter your work email to receive your report link.

Verify your email to view the full report and start 30 days of continuous monitoring. No credit card required.

Background

The cifs-utils package is essential for Linux systems, enabling users to mount SMB/CIFS shares, which are commonly used for file sharing in Microsoft Windows environments. This package provides tools that interact with the Linux kernel to facilitate the mounting of these shares, allowing users to access remote file systems as if they were local. However, a recent vulnerability has been identified that could lead to local privilege escalation, posing a significant security risk.

Vulnerability Detail

The vulnerability, identified as CVE-2026-12505, arises from a flaw in the cifs.upcall component of the cifs-utils package. An attacker with local access can exploit this vulnerability by forging a cifs.spnego key description, potentially allowing them to escalate their privileges on the system. This could lead to unauthorized access to sensitive data or the ability to execute arbitrary code with elevated privileges, significantly compromising the integrity and security of the affected system.

How To Fix

Minimum fixed version

0:7.0-5.el8_10

This is the first release that contains the fix.

sudo dnf update cifs-utils

Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →

Workaround

As a temporary workaround, users can limit access to the cifs-utils tools and ensure that only trusted users have local access to the system. Additionally, monitoring system logs for unusual activity may help mitigate potential exploitation until the package is updated.

Conclusion

The cifs-utils package has a critical vulnerability (CVE-2026-12505) that allows local privilege escalation, posing a serious risk to system security. It is crucial for users to update to the latest version of the package to mitigate this risk. Temporary workarounds can help reduce exposure until the update is applied.

See every vulnerability recorded for cifs-utils →