Bug 1438394 (CVE-2017-7374)

Summary:	CVE-2017-7374 kernel: use-after-free in keyring key revocation
Product:	[Other] Security Response	Reporter:	Martin Prpič <mprpic>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	agordeev, aquini, bhu, dhoward, esammons, fhrbata, gansalmon, hwkernel-mgr, iboverma, ichavero, itamar, jforbes, jkacur, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, nmurray, pholasek, plougher, rt-maint, rvrbovsk, slawomir, vdronov, williams
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 use-after-free flaw was found in the Linux kernel's file system encryption implementation. A local user could revoke keyring keys being used for ext4, f2fs, or ubifs encryption, causing a denial of service on the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-04-26 10:25:07 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:	1438395

Description Martin Prpič 2017-04-03 10:41:06 UTC

A use-after-free flaw was found in the Linux kernel's file system encryption implementation. A local user could revoke keyring keys being used for ext4, f2fs, or ubifs encryption, causing a denial of service on the system.

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1b53cf9815bb4744958d41f3795d5d5a1d365e2d

Comment 1 Justin M. Forbes 2017-04-03 12:23:14 UTC

This is fixed in Fedora with the 4.10.7 and newer stable kernel releases.

Comment 2 Vladis Dronov 2017-04-26 10:24:04 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7 and MRG-2 as the code where the flaw was found is not present in these products.