CVE-2017-15126: Linux Kernel

High severity, CVSS 8.1. EPSS: 4.1% chance of exploitation in the next 30 days.

A use-after-free flaw was found in fs/userfaultfd.c in the Linux kernel before 4.13.6. The issue is related to the handling of fork failure when dealing with event messages. Failure to fork correctly can lead to a situation where a fork event will be removed from an already freed list of events with userfaultfd_ctx_put().

Affected products

• Linux Linux Kernel: from 4.11, before 4.13.6 (fixed in 4.13.6)

Published 2018-01-14. Last modified 2026-06-17.