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.
https://launchpad.net/bugs/1534961
http://www.openwall.com/lists/oss-security/2021/10/18/1
http://www.openwall.com/lists/oss-security/2016/02/24/7
http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-1575.html
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e9f57ebcba563e0cd532926cab83c92bb4d79360
Source: Mitre, NVD
Published: 2016-05-02
Updated: 2025-04-12
Base Score: 7.2
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
Severity: High
Base Score: 7.8
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.00528