Bug 1249442 (CVE-2015-4176)

Summary:	CVE-2015-4176 kernel:deletion of a file or directory could unmount and reveal data under a mount point.
Product:	[Other] Security Response	Reporter:	Wade Mealing <wmealing>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	agordeev, aquini, dhoward, fhrbata, kernel-mgr, lwang, mguzik, nmurray, plougher, pmatouse, rvrbovsk, slawomir, slong
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A flaw was found in the Linux kernel where the deletion of a file or directory could trigger an unmount and reveal data under a mount point. This flaw was inadvertently introduced with the new feature of being able to lazily unmount a mount tree when using file system user namespaces.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-08-25 12:26:17 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1224245

Description Wade Mealing 2015-08-03 02:07:19 UTC

A flaw was found in the Linux kernel where the deletion of a file or directory could
trigger an unmount and reveal data under a mount point. This flaw was inadvertantly
introduced with the new feature of being able to lazily unmount a mount tree when
using filesystem user namespaces.

Upstream patch:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e0c9c0afd2fc958ffa34b697972721d81df8a56f

Comment 2 Petr Matousek 2017-08-25 12:26:17 UTC

Closing, based on https://bugzilla.redhat.com/show_bug.cgi?id=1224245#c19