CVE-2015-2925: Canonical Ubuntu Linux

Medium severity, CVSS 6.9. EPSS: 1.2% chance of exploitation in the next 30 days.

The prepend_path function in fs/dcache.c in the Linux kernel before 4.2.4 does not properly handle rename actions inside a bind mount, which allows local users to bypass an intended container protection mechanism by renaming a directory, related to a "double-chroot attack."

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 15.04 only
• Debian Debian Linux: version 7.0 only; version 8.0 only
• Linux Linux Kernel: before 3.2.72 (fixed in 3.2.72); from 3.3, before 3.4.110 (fixed in 3.4.110); from 3.5, before 3.10.91 (fixed in 3.10.91); from 3.11, before 3.12.49 (fixed in 3.12.49); from 3.13, before 3.14.55 (fixed in 3.14.55); from 3.15, before 3.16.35 (fixed in 3.16.35); …

Published 2015-11-16. Last modified 2026-06-17.