Bug 1500380 (CVE-2017-12188)

Summary: CVE-2017-12188 Kernel: KVM: MMU potential stack buffer overrun during page walks
Product: [Other] Security Response Reporter: Prasad Pandit <ppandit>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: aquini, benoit, bhu, blc, dhoward, dominik.mierzejewski, fhrbata, hkrzesin, hwkernel-mgr, iboverma, jkacur, jross, kernel-mgr, lgoncalv, matt, mcressma, mlangsdo, nmurray, plougher, rt-maint, rvrbovsk, williams
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
The Linux kernel built with the KVM visualization support (CONFIG_KVM), with nested visualization(nVMX) feature enabled (nested=1), was vulnerable to a stack buffer overflow issue. The vulnerability could occur while traversing guest page table entries to resolve guest virtual address(gva). An L1 guest could use this flaw to crash the host kernel resulting in denial of service (DoS) or potentially execute arbitrary code on the host to gain privileges on the system.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2019-06-08 03:28:44 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: 1500381, 1500382, 1500384, 1500385    
Bug Blocks: 1498990    

Description Prasad Pandit 2017-10-10 13:20:18 UTC 
Linux kernel built with the KVM virtualisation support(CONFIG_KVM), with
nested virtualisation(nVMX) feature enabled(nested=1), is vulnerable to a
stack buffer overflow issue. It could occur while traversing guest pagetable
entries to resolve guest virtual address(gva).

A L1 guest could use this flaw to crash the host kernel resulting in DoS.
OR potentially execute arbitrary code on the host to gain access to the
host system.

Upstream patch:
---------------
  -> https://www.spinics.net/lists/kvm/msg156651.html

Reference:
----------
  -> http://www.openwall.com/lists/oss-security/2017/10/12/17
Comment 3 Andrej Nemec 2017-10-11 10:52:15 UTC 
Upstream patches:

https://patchwork.kernel.org/patch/9996579/
https://patchwork.kernel.org/patch/9996587/
Comment 7 Benoit Donneaux 2017-11-24 13:31:17 UTC 
Not sure why the above statement is not inline with the whiteboard: rhel-7/kernel=affected ?
Comment 8 Adam Mariš 2017-11-29 13:21:58 UTC 
Statement:

This issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2.
Comment 9 errata-xmlrpc 2018-03-06 21:42:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0412 https://access.redhat.com/errata/RHSA-2018:0412
Comment 10 errata-xmlrpc 2018-03-06 21:42:54 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0395 https://access.redhat.com/errata/RHSA-2018:0395