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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2018-12-12T07:00:00

Updated: 2024-08-05T11:08:21.825Z

Reserved: 2018-10-16T00:00:00

Link: CVE-2018-18397

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2018-12-12T10:29:00.240

Modified: 2020-08-24T17:37:01.140

Link: CVE-2018-18397

cve-icon Redhat

Severity : Moderate

Publid Date: 2018-11-26T00:00:00Z

Links: CVE-2018-18397 - Bugzilla