CVE-2014-9717

 

Published at: - 02-05-2016 12:59

Last modified: - 21-09-2022 08:44

Total changes: - 2

Description

fs/namespace.c in the Linux kernel before 4.0.2 processes MNT_DETACH umount2 system calls without verifying that the MNT_LOCKED flag is unset, which allows local users to bypass intended access restrictions and navigate to filesystem locations beneath a mount by calling umount2 within a user namespace.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• [linux-kernel] 20141007 [PATCH] mnt: don't allow to detach the namespace root-
• https://bugzilla.redhat.com/show_bug.cgi?id=1226751
• https://github.com/torvalds/linux/commit/ce07d891a0891d3c0d0c2d73d577490486b809e1
• http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.2
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ce07d891a0891d3c0d0c2d73d577490486b809e1
• [oss-security] 20150417 USERNS allows circumventing MNT_LOCKED-
• [containers] 20150402 [PATCH review 0/19] Locked mount and loopback mount fixes-
• 74226-
• SUSE-SU-2016:1696-
• SUSE-SU-2016:1690-
• SUSE-SU-2016:1937-

 

Keywords

NVD

 

CVE-2014-9717

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures