Bug 1500391 (CVE-2017-15274)

Summary:	CVE-2017-15274 kernel: dereferencing NULL payload with nonzero length
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	airlied, ajax, aquini, bhu, blc, bskeggs, dhoward, eparis, esandeen, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, mmilgram, nhorman, nmurray, plougher, quintela, rt-maint, rvrbovsk, slawomir, steved, vdronov, williams, wmealing, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 4.12	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the implementation of associative arrays where the add_key systemcall and KEYCTL_UPDATE operations allowed for a NULL payload with a nonzero length. When accessing the payload within this length parameters value, an unprivileged user could trivially cause a NULL pointer dereference (kernel oops).	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-07-30 13:18:20 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:	1502906, 1502907, 1502908, 1502909, 1502910, 1502911, 1502912, 1574442, 1695843, 1695844
Bug Blocks:	1500394

Description Adam Mariš 2017-10-10 13:31:18 UTC

A flaw was found in the linux kernels implementation of associative arrays.  The add_key systemcall and KEYCTL_UPDATE operations allowed for a NULL payload with a nonzero length.  When accessing the payload within this length parameters value, an unprivileged user could trivially cause a NULL pointer dereference (kernel oops).

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5649645d725c73df4302428ee4e02c869248b4c5

Comment 2 Wade Mealing 2017-10-17 05:13:34 UTC

Statement:

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise
Linux 5,6,7, MRG-2 and realtime kernels.

Red Hat Enterprise Linux 5 has transitioned to Production phase 3.  
During the Production 3 Phase, Critical impact Security Advisories (RHSAs) 
and selected Urgent Priority Bug Fix Advisories (RHBAs) may be released 
as they become available.

At this time this bug is not meet this critera and is unlikley to be fixed
for these releases.

The official life cycle policy can be reviewed here:

http://redhat.com/rhel/lifecycle

Future Linux kernel updates for the products in production phase 1 and 2, namely Red Hat Enterprise
Linux 6, 7 and MRG-2 may address this issue.

Comment 8 errata-xmlrpc 2019-07-30 09:08:56 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.4 Extended Update Support

Via RHSA-2019:1946 https://access.redhat.com/errata/RHSA-2019:1946

Comment 9 Product Security DevOps Team 2019-07-30 13:18:20 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2017-15274