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.

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Advisories
Source ID Title
EUVD EUVD EUVD-2018-10126 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.
Ubuntu USN Ubuntu USN USN-3901-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-3901-2 Linux kernel (HWE) vulnerabilities
Ubuntu USN Ubuntu USN USN-3903-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-3903-2 Linux kernel (HWE) vulnerabilities
Fixes

Solution

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

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

Reserved: 2018-10-16T00:00:00.000Z

Link: CVE-2018-18397

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

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

Modified: 2024-11-21T03:55:52.280

Link: CVE-2018-18397

cve-icon Redhat

Severity : Moderate

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

Links: CVE-2018-18397 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses