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Bug 1735630 (CVE-2019-13648)

Summary:	CVE-2019-13648 kernel: denial of service in arch/powerpc/kernel/signal_32.c and arch/powerpc/kernel/signal_64.c via sigreturn() system call
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, airlied, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, fhrbata, hannsj_uhl, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, john.j5live, jonathan, josef, jross, jshortt, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, mmilgram, nmurray, plougher, rt-maint, rvrbovsk, steved, 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 found in the PowerPc platform, where the kernel will panic if the transactional memory is disabled. An attacker could use this flaw to panic the system by constructing a signal context through the transactional memory MSR bits set.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-07-21 19:27:41 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:	1735631, 1802829, 1802830, 1802832, 1802833, 1837073
Bug Blocks:	1732753, 1732823

Description Dhananjay Arunesh 2019-08-01 07:43:28 UTC

A vulnerability was found in on the powerpc platform, when hardware transactional memory is disabled, a local user can cause a denial of service (Transaction Memory exception and system crash) via a sigreturn() system call that sends a crafted signal frame. This affects arch/powerpc/kernel/signal_32.c and arch/powerpc/kernel/signal_64.c.

Reference:
https://patchwork.ozlabs.org/patch/1133904/
https://git.kernel.org/torvalds/c/f16d80b75a096c52354c6e0a574993f3b0dfbdfe
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/testing/selftests/powerpc/signal/sigfuz.c?h=v5.2

Comment 1 Dhananjay Arunesh 2019-08-01 07:43:55 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1735631]

Comment 5 Wade Mealing 2020-02-14 01:10:11 UTC

Red hat Enterprise Linux 7 kernels before kernel-3.10.0-1065.el7 were affected by this flaw.

Comment 9 errata-xmlrpc 2020-03-31 19:11:54 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:1016 https://access.redhat.com/errata/RHSA-2020:1016

Comment 12 errata-xmlrpc 2020-07-21 13:41:12 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.7 Extended Update Support

Via RHSA-2020:3019 https://access.redhat.com/errata/RHSA-2020:3019

Comment 13 Product Security DevOps Team 2020-07-21 19:27:41 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-2019-13648