Bug 1888886 (CVE-2020-27152) - CVE-2020-27152 Kernel: KVM: host stack overflow due to lazy update IOAPIC
Summary: CVE-2020-27152 Kernel: KVM: host stack overflow due to lazy update IOAPIC
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-27152
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: Red Hat1867373 Red Hat1882793 1888887 Red Hat1888888 Red Hat1906438 Red Hat1906439
Blocks: Embargoed1888749
TreeView+ depends on / blocked
 
Reported: 2020-10-16 06:16 UTC by Prasad Pandit
Modified: 2023-05-12 21:18 UTC (History)
47 users (show)

Fixed In Version: Linux 5.10
Doc Type: If docs needed, set a value
Doc Text:
A stack overflow flaw via an infinite loop condition issue was found in the KVM hypervisor of the Linux kernel. This flaw occurs while processing interrupts because the IRQ state is erroneously set. This flaw allows a guest user to crash the host kernel, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Clone Of:
Environment:
Last Closed: 2021-04-06 17:35:14 UTC

Attachments (Terms of Use)

Description Prasad Pandit 2020-10-16 06:16:25 UTC 
A stack overflow via an infinite loop condition issue was found in the KVM hypervisor of the Linux kernel. It could occur while processing interrupts because irq state is erroneously set. A guest user may use this flaw to crash the host kernel resulting in DoS scenario.

Upstream patch:
---------------
  -> https://git.kernel.org/linus/77377064c3a94911339f13ce113b3abf265e06da

Reference:
----------
  -> https://www.openwall.com/lists/oss-security/2020/11/03/1
Comment 2 Prasad Pandit 2020-10-16 06:17:15 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1888887]
Comment 5 RaTasha Tillery-Smith 2020-10-20 15:25:03 UTC 
Mitigation:

Disabling APICV by setting the kvm_intel.enable_apicv=0 parameter helps to avoid this situation.
Comment 6 Paolo Bonzini 2020-10-24 09:08:10 UTC 
Patch sent upstream.
Comment 7 Prasad Pandit 2020-11-03 10:47:37 UTC 
External References:

https://bugzilla.kernel.org/show_bug.cgi?id=208767
https://www.openwall.com/lists/oss-security/2020/11/03/1
https://git.kernel.org/linus/77377064c3a94911339f13ce113b3abf265e06da
Comment 9 Prasad Pandit 2020-11-03 11:04:28 UTC 
Statement:

This issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2.
This issue affects the version of the kernel package as shipped with Red Hat Enterprise Linux 8. Future kernel updates for Red Hat Enterprise Linux 8  may address this issue.
Comment 10 Justin M. Forbes 2020-11-04 16:27:21 UTC 
This was fixed for Fedora with the 5.8.17 stable kernel update.
Comment 12 errata-xmlrpc 2021-04-06 13:58:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1081 https://access.redhat.com/errata/RHSA-2021:1081
Comment 13 errata-xmlrpc 2021-04-06 14:17:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1093 https://access.redhat.com/errata/RHSA-2021:1093
Comment 14 Product Security DevOps Team 2021-04-06 17:35:14 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-2020-27152
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