Bug 1439087 (CVE-2014-9922)

Summary:	CVE-2014-9922 kernel: Privilege escalation in eCryptfs subsystem via a large filesystem stack
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aquini, bhu, dhoward, esandeen, fhrbata, gansalmon, hwkernel-mgr, iboverma, ichavero, itamar, jforbes, jkacur, jonathan, jross, jstancek, jwboyer, kernel-maint, kernel-mgr, kyoshida, lgoncalv, madhu.chinakonda, mchehab, mcressma, mprpic, msiddiqu, nmurray, pholasek, rt-maint, rvrbovsk, security-response-team, skozina, slawomir, swhiteho, vdronov, williams, wmealing
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was discovered in the way the kernel allows stackable filesystems to overlay. A local attacker who is able to mount filesystems can abuse this flaw to escalate privileges.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-27 10:52:19 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:	1446439, 1446440, 1446441, 1446442, 1446443
Bug Blocks:	1439088

Description Andrej Nemec 2017-04-05 08:15:35 UTC

The eCryptfs subsystem in the Linux kernel allows local users to gain privileges via layering a large filesystem stack that includes an overlayfs layer, related to fs/ecryptfs/main.c and fs/overlayfs/super.c.

Upstream patch:

https://github.com/torvalds/linux/commit/69c433ed2ecd2d3264efd7afec4439524b319121

References:

http://source.android.com/security/bulletin/2017-04-01.html