CVE-2017-15126
kernel: Use-after-free in userfaultfd_event_wait_completion function in userfaultfd.c
Severity
ModerateRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · December 5, 2017
Updated · June 28, 2026
Description
A flaw was found in the Linux kernel's handling of fork failure when dealing with event messages in the userfaultfd code. Failure to fork correctly can create a fork event that will be removed from an already freed list of events.
Statement
This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6.
This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7, realtime, MRG-2 prior to version kernel-3.10.0-781.
The kernel-alt package already as shipped contains this fix.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.0 · 7CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer