Bug 1581650 (CVE-2018-3693)

Summary:	CVE-2018-3693 Kernel: speculative bounds check bypass store
Product:	[Other] Security Response	Reporter:	Prasad Pandit <ppandit>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	aarcange, airlied, andrew.schofield, aquini, bhu, blc, bskeggs, cperry, crrobins, dhoward, dvlasenk, esammons, ewk, fhrbata, hannsj_uhl, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jbastian, jcm, jforbes, jglisse, jkacur, john.j5live, jonathan, josef, jross, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, mvanderw, nmurray, pbonzini, plougher, pmatouse, rcain, rt-maint, rvrbovsk, security-response-team, skozina, slawomir, steved, williams, yjog, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions past bounds check. The flaw relies on the presence of a precisely-defined instruction sequence in the privileged code and the fact that memory writes occur to an address which depends on the untrusted value. Such writes cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to influence speculative execution and/or read privileged memory by conducting targeted cache side-channel attacks.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-11-21 11:27:31 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:	1589032, 1589033, 1589034, 1589035, 1589036, 1589037, 1590090, 1590091, 1590092, 1590093, 1590094, 1590095, 1590096, 1590097, 1590098, 1590099, 1590100, 1599832, 1599833
Bug Blocks:	1581208, 1595197, 1595198, 1595199, 1595200

Description Prasad Pandit 2018-05-23 10:00:19 UTC

An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions past bounds check.

It relies on the presence of a precisely-defined instruction sequence in the privileged code and the fact that memory writes occur to an address which depends on the untrusted value. Such writes cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire).

As a result, an unprivileged attacker could use this flaw to influence speculative execution and/or read privileged memory by conducting targeted cache side-channel attacks.

Comment 3 Prasad Pandit 2018-06-19 09:24:48 UTC

Statement:

This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2. Future kernel updates for Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2 may address this issue.

Comment 6 Prasad Pandit 2018-07-10 09:53:35 UTC

Acknowledgments:

Name: Vladimir Kiriansky (MIT), Carl Waldspurger (Carl Waldspurger Consulting)

Comment 7 Prasad Pandit 2018-07-10 17:08:31 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1599832]

Comment 9 Yogendra Jog 2018-07-10 17:10:07 UTC

External References:

https://access.redhat.com/solutions/3523601
https://people.csail.mit.edu/vlk/spectre11.pdf
https://01.org/security/advisories/intel-oss-10002
https://software.intel.com/sites/default/files/managed/4e/a1/337879-analyzing-potential-bounds-Check-bypass-vulnerabilities.pdf

Comment 10 errata-xmlrpc 2018-08-14 18:26:03 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2018:2390 https://access.redhat.com/errata/RHSA-2018:2390

Comment 11 errata-xmlrpc 2018-08-14 18:44:32 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:2384 https://access.redhat.com/errata/RHSA-2018:2384

Comment 12 errata-xmlrpc 2018-08-14 20:24:08 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:2395 https://access.redhat.com/errata/RHSA-2018:2395

Comment 13 Justin M. Forbes 2018-08-20 17:17:34 UTC

The kernel portion has been addressed with kernel-4.17.15 across all fedora stable releases.

Comment 14 errata-xmlrpc 2019-07-30 09:09:00 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 15 errata-xmlrpc 2020-01-21 15:49:30 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:0174 https://access.redhat.com/errata/RHSA-2020:0174