CVE-2018-18397

MediumCVSS 5.5/10Last modified Jun 17, 2026

Description

The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles access control for certain UFFDIO_ ioctl calls, as demonstrated by allowing local users to write data into holes in a tmpfs file (if the user has read-only access to that file, and that file contains holes), related to fs/userfaultfd.c and mm/userfaultfd.c.

Metrics

CVSS 3.0 5.5/10CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-863

Affected software

No affected versions have been published.

Timeline

Published: Dec 12, 2018
Last modified: Jun 17, 2026
NVD status: Modified

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