REDHAT-BUG-1919210: Null Pointer Dereference
First published: Fri Jan 22 2021(Updated: )
A NULL pointer dereference issue was found in the Floopy disk emulator of QEMU. It could occur while processing read/write ioport commands, if the selected Floopy drive is not initialised with a block device. A privileged guest user could use this flaw to crash the QEMU process on the host resulting in DoS scenario. Upstream patch: --------------- -> <a href="https://lists.nongnu.org/archive/html/qemu-devel/2021-01/msg05986.html">https://lists.nongnu.org/archive/html/qemu-devel/2021-01/msg05986.html</a>
| Affected Software | Affected Version | How to fix |
|---|---|---|
| QEMU |
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Reference Links
- https://lists.nongnu.org/archive/html/qemu-devel/2021-01/msg05986.html
- https://bugs.launchpad.net/qemu/+bug/1912780
- https://www.openwall.com/lists/oss-security/2021/01/28/1
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1919532
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1919533
- https://access.redhat.com/support/policy/updates/errata/
- https://access.redhat.com/errata/RHSA-2022:0325
- https://access.redhat.com/errata/RHSA-2022:0397
- https://access.redhat.com/security/cve/cve-2021-20196
- https://access.redhat.com/errata/RHSA-2022:1759
- https://bugzilla.redhat.com/show_bug.cgi?id=1919210
Frequently Asked Questions
What is the severity of REDHAT-BUG-1919210?
REDHAT-BUG-1919210 is classified as a critical vulnerability due to its potential to crash the QEMU process.
How do I fix REDHAT-BUG-1919210?
To resolve REDHAT-BUG-1919210, ensure that the Floopy drive is properly initialized with a block device.
Who is affected by REDHAT-BUG-1919210?
The vulnerability REDHAT-BUG-1919210 affects users of the QEMU emulator, specifically those utilizing the Floopy disk emulator without proper initialization.
What causes REDHAT-BUG-1919210?
REDHAT-BUG-1919210 is caused by a NULL pointer dereference when read/write IO port commands are processed for an uninitialized Floopy drive.
Can a guest user exploit REDHAT-BUG-1919210?
Yes, a privileged guest user can exploit REDHAT-BUG-1919210 to crash the QEMU process on the host system.
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