Bug 1629940 (CVE-2018-14656)

Summary:	CVE-2018-14656 kernel: Arbitrary Kernel Read into dmesg via Missing Address Check in segfault Handler
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	abhgupta, airlied, aquini, bhu, blc, bskeggs, chuhu, dbaker, dhoward, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, john.j5live, jokerman, jonathan, josef, jross, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, plougher, psampaio, rt-maint, rvrbovsk, security-response-team, skozina, slawomir, sparks, steved, sthangav, trankin, 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 missing address check in the callers of the show_opcodes() in the Linux kernel allows an attacker to dump the kernel memory at an arbitrary kernel address into the dmesg log.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-08-08 13:18:28 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:	1629941, 1629942, 1632820, 1635876
Bug Blocks:	1629943

Description Pedro Sampaio 2018-09-17 16:21:46 UTC

A missing address check in the callers of the show_opcodes() in the Linux kernel allows an attacker to dump the kernel memory at an arbitrary kernel address into the dmesg log.

References:

https://bugs.chromium.org/p/project-zero/issues/detail?id=1650

https://lore.kernel.org/lkml/20180828154901.112726-1-jannh@google.com/T/

https://seclists.org/oss-sec/2018/q4/9

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=342db04ae71273322f0011384a9ed414df8bdae4

Comment 1 Pedro Sampaio 2018-09-17 16:23:49 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1629942]

Comment 3 Justin M. Forbes 2018-09-17 19:09:44 UTC

This is fixed for Fedora with the 4.18.6 stable updates.

Comment 11 Petr Matousek 2018-10-09 10:30:25 UTC

External References:

https://bugs.chromium.org/p/project-zero/issues/detail?id=1650

Comment 13 Product Security DevOps Team 2019-08-08 13:18:28 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-2018-14656