Bug 1983686 (CVE-2021-3653)

Summary: CVE-2021-3653 kernel: SVM nested virtualization issue in KVM (AVIC support)
Product: [Other] Security Response Reporter: Mauro Matteo Cascella <mcascell>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: acaringi, adscvr, airlied, alciregi, bhu, blc, brdeoliv, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarod, jarodwilson, jeremy, jforbes, jlelli, jmaloy, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mlangsdo, mlevitsk, nmurray, pbonzini, ptalbert, qzhao, rhandlin, rvrbovsk, security-response-team, steved, walters, williams
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: kernel 5.14-rc7 Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the "int_ctl" field, this issue could allow a malicious L1 to enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape.
Story Points: ---
Clone Of: Environment:
Last Closed: 2021-09-15 12:21:09 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: 1985403, 1985404, 1985405, 1985406, 1985407, 1985408, 1985409, 1985410, 1985411, 1985412, 1985413, 1985414, 1985415, 1985416, 1985417, 1985418, 1985419, 1985420, 1995451    
Bug Blocks: 1983680, 1983775    

Description Mauro Matteo Cascella 2021-07-19 13:54:37 UTC
A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the "int_ctl" field, this issue could allow a malicious L1 to enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest would be allowed to to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape.

Upstream fix:
https://git.kernel.org/pub/scm/virt/kvm/kvm.git/commit/?id=0f923e07124df069ba68d8bb12324398f4b6b709

Comment 5 Mauro Matteo Cascella 2021-08-02 15:01:16 UTC
This bug dates way back to kernel 2.6.30 where it was first introduced via commit:
https://github.com/torvalds/linux/commit/3d6368ef580a

Comment 6 Mauro Matteo Cascella 2021-08-19 07:24:10 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1995451]

Comment 10 errata-xmlrpc 2021-09-15 10:06:55 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:3547 https://access.redhat.com/errata/RHSA-2021:3547

Comment 11 errata-xmlrpc 2021-09-15 10:24:14 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:3548 https://access.redhat.com/errata/RHSA-2021:3548

Comment 12 Product Security DevOps Team 2021-09-15 12:21:09 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-2021-3653

Comment 13 errata-xmlrpc 2021-09-28 14:34:51 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.1 Extended Update Support

Via RHSA-2021:3676 https://access.redhat.com/errata/RHSA-2021:3676

Comment 14 errata-xmlrpc 2021-10-12 07:24:27 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.2 Advanced Update Support

Via RHSA-2021:81932 https://access.redhat.com/errata/RHSA-2021:81932

Comment 15 errata-xmlrpc 2021-10-12 15:04:51 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.6 Advanced Update Support
  Red Hat Enterprise Linux 7.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 7.6 Telco Extended Update Support

Via RHSA-2021:3812 https://access.redhat.com/errata/RHSA-2021:3812

Comment 16 errata-xmlrpc 2021-10-12 15:29:03 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2021:3801 https://access.redhat.com/errata/RHSA-2021:3801

Comment 17 errata-xmlrpc 2021-10-12 15:29:20 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2021:3802 https://access.redhat.com/errata/RHSA-2021:3802

Comment 19 errata-xmlrpc 2021-10-19 06:51:09 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Extended Update Support

Via RHSA-2021:3909 https://access.redhat.com/errata/RHSA-2021:3909

Comment 20 errata-xmlrpc 2021-10-19 07:03:06 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Extended Update Support

Via RHSA-2021:3904 https://access.redhat.com/errata/RHSA-2021:3904

Comment 21 errata-xmlrpc 2021-10-26 07:38:07 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.7 Advanced Update Support
  Red Hat Enterprise Linux 7.7 Update Services for SAP Solutions
  Red Hat Enterprise Linux 7.7 Telco Extended Update Support

Via RHSA-2021:3987 https://access.redhat.com/errata/RHSA-2021:3987

Comment 23 errata-xmlrpc 2021-11-16 10:47:52 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.4 Advanced Update Support

Via RHSA-2021:4692 https://access.redhat.com/errata/RHSA-2021:4692

Comment 24 errata-xmlrpc 2021-11-23 10:57:57 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.3 Advanced Update Support

Via RHSA-2021:4768 https://access.redhat.com/errata/RHSA-2021:4768