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Tool Directory

CVE-2016-1575

HighPublished

The overlayfs implementation in the Linux kernel through 4.5.2 does not properly maintain POSIX ACL xattr data, which allows local users to gain privileges...

Published: May 2, 2016
Updated: Aug 5, 2024
Assigning CNA: canonical
Evidence observed: Nov 22, 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

0.9%

Low · next 30 days

Percentile: 58.3%
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 overlayfs implementation in the Linux kernel through 4.5.2 does not properly maintain POSIX ACL xattr data, which allows local users to gain privileges by leveraging a group-writable setgid directory.

Sources

Ubuntu 14.04/15.10 - User Namespace Overlayfs Xattr SetGID Privilege EscalationExploit
halfdog · linux · Nov 22, 2016

Responsible use

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