Bug 1922441 (CVE-2021-20203) - CVE-2021-20203 qemu: Failed malloc in vmxnet3_activate_device() in hw/net/vmxnet3.c
Summary: CVE-2021-20203 qemu: Failed malloc in vmxnet3_activate_device() in hw/net/vmx...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2021-20203
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1922719
Blocks: 1905617
TreeView+ depends on / blocked
 
Reported: 2021-01-29 17:55 UTC by Pedro Sampaio
Modified: 2021-11-19 12:34 UTC (History)
27 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
An integer overflow flaw was found in the vmxnet3 NIC emulator of QEMU. This issue occurs when a guest supplies invalid values for the rx/tx queue size or other NIC parameters. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service.
Clone Of:
Environment:
Last Closed: 2021-01-31 08:41:42 UTC
Embargoed:

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Description Pedro Sampaio 2021-01-29 17:55:15 UTC 
An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU. It may occur if a guest was to supply invalid values for rx/tx queue size or other NIC parameters. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg07935.html
Comment 1 Prasad Pandit 2021-01-31 04:21:46 UTC 
Acknowledgments:

Name: Gaoning Pan (Zhejiang University & Ant Security Light-Year Lab)
Comment 2 Prasad Pandit 2021-01-31 04:21:50 UTC 
Statement:

This issue does not affect the versions of the qemu-kvm package as shipped with Red Hat Enterprise Linux 5, 6, 7 and 8.
Comment 3 Prasad Pandit 2021-01-31 04:21:53 UTC 
External References:

https://bugs.launchpad.net/qemu/+bug/1913873
Comment 4 Prasad Pandit 2021-01-31 04:28:42 UTC 
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1922719]
Comment 5 Product Security DevOps Team 2021-01-31 08:41:42 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-2021-20203
Comment 8 Philippe Mathieu-Daudé 2021-11-19 12:34:19 UTC 
Fixed by https://gitlab.com/qemu-project/qemu/-/commit/d05dcd94aee88
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