CVE-2015-4177

MEDIUM

Linux Kernel < 4.0.4 - Denial of Service

Title source: rule

Description

The collect_mounts function in fs/namespace.c in the Linux kernel before 4.0.5 does not properly consider that it may execute after a path has been unmounted, which allows local users to cause a denial of service (system crash) by leveraging user-namespace root access for an MNT_DETACH umount2 system call.

References (7)

[Vendor Advisory] http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cd4a40174b71acd021877341684d8bb1dc8ea4ae

[Vendor Advisory] http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.5

[Issue Tracking] https://bugzilla.redhat.com/show_bug.cgi?id=1248486

[Vendor Advisory] https://github.com/torvalds/linux/commit/cd4a40174b71acd021877341684d8bb1dc8ea4ae

View Writeup ZIP pw:eip

[Mailing List] http://openwall.com/lists/oss-security/2015/05/29/10

[Mailing List] http://openwall.com/lists/oss-security/2015/05/29/5

[Mailing List] http://www.openwall.com/lists/oss-security/2015/06/04/5

Scores

CVSS v3 5.5

EPSS 0.0004

EPSS Percentile 12.7%

Attack Vector LOCAL

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

Classification

Status draft

Affected Products (1)

linux/linux_kernel < 4.0.4

Timeline

Published May 02, 2016

Tracked Since Feb 18, 2026