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: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: 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:
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