REDHAT-BUG-1922441: Integer Overflow
First published: Fri Jan 29 2021(Updated: )
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: --------------- -> <a href="https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg07935.html">https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg07935.html</a>
| Affected Software | Affected Version | How to fix |
|---|---|---|
| QEMU |
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Reference Links
- https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg07935.html
- https://bugs.launchpad.net/qemu/+bug/1913873
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1922719
- https://access.redhat.com/security/cve/cve-2021-20203
- https://gitlab.com/qemu-project/qemu/-/commit/d05dcd94aee88
- https://bugzilla.redhat.com/show_bug.cgi?id=1922441
Frequently Asked Questions
What is the severity of REDHAT-BUG-1922441?
The severity of REDHAT-BUG-1922441 is critical as it can lead to a denial-of-service (DoS) condition on the host.
How does REDHAT-BUG-1922441 affect QEMU?
REDHAT-BUG-1922441 affects QEMU by allowing a privileged guest user to crash the QEMU process due to an integer overflow in the vmxnet3 NIC emulator.
How do I fix REDHAT-BUG-1922441?
To fix REDHAT-BUG-1922441, apply the upstream patch provided by QEMU maintainers.
What versions of QEMU are affected by REDHAT-BUG-1922441?
REDHAT-BUG-1922441 affects multiple versions of QEMU that include the vmxnet3 NIC emulator.
Who can exploit REDHAT-BUG-1922441?
A privileged guest user can exploit REDHAT-BUG-1922441 by supplying invalid values for NIC parameters.
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