Bug 2259701 (CVE-2023-46838)

Summary:	CVE-2023-46838 xen: netback processing of zero-length transmit fragment
Product:	[Other] Security Response	Reporter:	Zack Miele <zmiele>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	Keywords:	Security
Target Milestone:	---
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Hardware:	All
OS:	Linux
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Last Closed:	2024-03-22 15:30:21 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Embargoed:
Bug Depends On:	2259702
Bug Blocks:

Description Zack Miele 2024-01-22 20:53:02 UTC

Transmit requests in Xen's virtual network protocol can consist of
multiple parts.  While not really useful, except for the initial part
any of them may be of zero length, i.e. carry no data at all.  Besides a
certain initial portion of the to be transferred data, these parts are
directly translated into what Linux calls SKB fragments.  Such converted
request parts can, when for a particular SKB they are all of length
zero, lead to a de-reference of NULL in core networking code.

An unprivileged guest can cause Denial of Service (DoS) of the host by
sending network packets to the backend, causing the backend to crash.

Comment 1 Zack Miele 2024-01-22 20:53:15 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 2259702]

Comment 2 Zack Miele 2024-03-22 15:30:19 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.