CVE-2015-8839: Canonical Ubuntu Linux

Medium severity, CVSS 5.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Multiple race conditions in the ext4 filesystem implementation in the Linux kernel before 4.5 allow local users to cause a denial of service (disk corruption) by writing to a page that is associated with a different user's file after unsynchronized hole punching and page-fault handling.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only
• Linux Linux Kernel: up to and including 4.4.221; version 4.5 only

Published 2016-05-02. Last modified 2026-06-17.