Bug 1620555 (CVE-2018-15594)

Summary:	CVE-2018-15594 kernel: Mishandling of indirect calls weakens Spectre mitigation for paravirtual guests
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:	airlied, aquini, bhu, blc, bskeggs, dhoward, dmoppert, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, john.j5live, jonathan, josef, jross, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, plougher, rt-maint, rvrbovsk, skozina, slawomir, steved, 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:	It was found that paravirt_patch_call/jump() functions in the arch/x86/kernel/paravirt.c in the Linux kernel mishandles certain indirect calls, which makes it easier for attackers to conduct Spectre-v2 attacks against paravirtualized guests.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-08-06 13:19:07 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:	1620557, 1620558, 1626416, 1626417, 1626418, 1626419, 1626420, 1632820, 1772246, 1772247, 1772248, 1772249
Bug Blocks:	1620559

Description Andrej Nemec 2018-08-23 07:32:28 UTC

It was found that arch/x86/kernel/paravirt.c in the Linux kernel before 4.18.1 It was found that paravirt_patch_call/jump() functions in the arch/x86/kernel/paravirt.c in the Linux kernel mishandle certain indirect calls, which makes it easier for attackers to conduct Spectre-v2 attacks against paravirtualized guests.

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5800dc5c19f34e6e03b5adab1282535cb102fafd

Comment 1 Andrej Nemec 2018-08-23 07:33:52 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1620557]

Comment 3 Justin M. Forbes 2018-08-23 11:51:04 UTC

This was fixed for Fedora users with the 4.17.14-202 kernel update.

Comment 7 errata-xmlrpc 2019-08-06 12:04:16 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:2029 https://access.redhat.com/errata/RHSA-2019:2029

Comment 8 errata-xmlrpc 2019-08-06 12:06:40 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:2043 https://access.redhat.com/errata/RHSA-2019:2043

Comment 9 Product Security DevOps Team 2019-08-06 13:19:07 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-2018-15594