Bug 1248486 (CVE-2015-4177) - CVE-2015-4177 kernel: Race conditions in collect_mounts
Summary: CVE-2015-4177 kernel: Race conditions in collect_mounts
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2015-4177
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 1224245
TreeView+ depends on / blocked
 
Reported: 2015-07-30 11:46 UTC by Wade Mealing
Modified: 2021-02-17 05:04 UTC (History)
31 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A flaw was discovered in the kernel's collect_mounts function. If the kernel's audit subsystem called collect_mounts to audit an unmounted path, it could panic the system. With this flaw, an unprivileged user could call umount(MNT_DETACH) to launch a denial-of-service attack.
Clone Of:
Environment:
Last Closed: 2017-08-25 12:28:16 UTC
Embargoed:

Attachments (Terms of Use)

Description Wade Mealing 2015-07-30 11:46:36 UTC 
The audit subsystem can call collect_mounts, which if attempting to audit
a mountpoint which is no longer mounted can panic the system.

Upstream patch:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cd4a40174b71acd021877341684d8bb1dc8ea4ae

CVE Request:
http://seclists.org/oss-sec/2015/q2/640
Comment 4 Wade Mealing 2015-08-20 03:51:34 UTC 
Statement:

This issue does not affect the Linux kernels as shipped with Red Hat Enterprise Linux 5, 6, MRG-2, realtime and arm-kernels.

The issue is not currently planned to be addressed in Red Hat Enterprise Linux 7.
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