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CVE-2016-2854

HighPublished

The aufs module for the Linux kernel 3.x and 4.x does not properly maintain POSIX ACL xattr data, which allows local users to gain privileges by leveraging...

Published: May 2, 2016
Updated: Aug 5, 2024
Assigning CNA: mitre
Evidence observed: Feb 19, 2016

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

1.0%

Low · next 30 days

Percentile: 59.2%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

The aufs module for the Linux kernel 3.x and 4.x does not properly maintain POSIX ACL xattr data, which allows local users to gain privileges by leveraging a group-writable setgid directory.

Sources

AUFS (Ubuntu 15.10) - 'allow_userns' Fuse/Xattr User Namespaces Privilege EscalationExploit
halfdog · linux · Feb 19, 2016

Responsible use

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