CVE-2018-13405

HighCVSS 7.8/10Last modified Jun 17, 2026

Description

The inode_init_owner function in fs/inode.c in the Linux kernel through 3.16 allows local users to create files with an unintended group ownership, in a scenario where a directory is SGID to a certain group and is writable by a user who is not a member of that group. Here, the non-member can trigger creation of a plain file whose group ownership is that group. The intended behavior was that the non-member can trigger creation of a directory (but not a plain file) whose group ownership is that group. The non-member can escalate privileges by making the plain file executable and SGID.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-269

Affected software

VendorProductVersions
n/an/an/a

References

Timeline

Published
Jul 6, 2018
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2018-13405: High severity, CVSS 7.8 | Vulnix