Bug 1930646 (CVE-2021-20255) - CVE-2021-20255 QEMU: net: eepro100: stack overflow via infinite recursion
Summary: CVE-2021-20255 QEMU: net: eepro100: stack overflow via infinite recursion
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2021-20255
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: 1930647 1930648
Blocks: 1887771 1930894
TreeView+ depends on / blocked
 
Reported: 2021-02-19 11:00 UTC by Prasad J Pandit
Modified: 2021-08-04 08:49 UTC (History)
27 users (show)

Fixed In Version:
Doc Type: ---
Doc Text:
A stack overflow via an infinite recursion vulnerability was found in the eepro100 i8255x device emulator of QEMU. This issue occurs while processing controller commands due to a DMA reentry issue. This flaw allows a guest user or process to consume CPU cycles or crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Clone Of:
Environment:
Last Closed: 2021-02-19 13:01:55 UTC


Attachments (Terms of Use)

Description Prasad J Pandit 2021-02-19 11:00:49 UTC
A stack overflow via infinite recursion issue was found in the eepro100 i8255x device emulator of QEMU. It could occur while processing controller commands due to DMA re-entrancy issue. A guest user/process may use this flaw to consume cpu cycles or crash the QEMU process on the host resulting in DoS scenario.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg06098.html

Comment 1 Prasad J Pandit 2021-02-19 11:00:59 UTC
Acknowledgments:

Name: Sergej Schumilo (Ruhr-University Bochum), Cornelius Aschermann (Ruhr-University Bochum), Simon Werner (Ruhr-University Bochum)

Comment 4 Prasad J Pandit 2021-02-19 11:01:54 UTC
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1930647]


Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1930648]

Comment 7 RaTasha Tillery-Smith 2021-02-22 18:06:02 UTC
Statement:

This issue does not affect the version of the qemu-kvm package shipped with Red Hat Enterprise Linux 7 and 8.

This issue has been rated as having Low security impact and is not currently planned to be addressed in future updates of the Red Hat Enterprise Linux 6. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.


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