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Bug 1581650 - (CVE-2018-3693) CVE-2018-3693 Kernel: speculative bounds check bypass store
CVE-2018-3693 Kernel: speculative bounds check bypass store
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20180710:1700...
: Security
Depends On: 1589037 1590098 1599833 1589032 1589033 1589034 1589035 1589036 1590090 1590091 1590092 1590093 1590094 1590095 1590096 1590097 1590099 1590100 1599832
Blocks: 1581208 1595197 1595198 1595199 1595200
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Reported: 2018-05-23 06:00 EDT by Prasad J Pandit
Modified: 2018-08-29 01:36 EDT (History)
57 users (show)

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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.
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:2384 None None None 2018-08-14 14:44 EDT
Red Hat Product Errata RHSA-2018:2390 None None None 2018-08-14 14:26 EDT
Red Hat Product Errata RHSA-2018:2395 None None None 2018-08-14 16:24 EDT

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Description Prasad J Pandit 2018-05-23 06:00:19 EDT 
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 J Pandit 2018-06-19 05:24:48 EDT 
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 J Pandit 2018-07-10 05:53:35 EDT 
Acknowledgments:

Name: Vladimir Kiriansky (MIT), Carl Waldspurger (Carl Waldspurger Consulting)
Comment 7 Prasad J Pandit 2018-07-10 13:08:31 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1599832]
Comment 10 errata-xmlrpc 2018-08-14 14:26:03 EDT 
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 14:44:32 EDT 
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 16:24:08 EDT 
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 13:17:34 EDT 
The kernel portion has been addressed with kernel-4.17.15 across all fedora stable releases.
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