Bug 2279965 (CVE-2024-4693)

Summary:	CVE-2024-4693 qemu-kvm: virtio-pci: improper release of configure vector leads to guest triggerable crash
Product:	[Other] Security Response	Reporter:	Mauro Matteo Cascella <mcascell>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	ailan, ddepaula, jen, jferlan, jmaloy, kkiwi, knoel, mrezanin, mst, nilal, pbonzini, ymankad
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the QEMU Virtio PCI Bindings (hw/virtio/virtio-pci.c). An improper release and use of the irqfd for vector 0 during the boot process leads to a guest triggerable crash via vhost_net_stop(). This flaw allows a malicious guest to crash the QEMU process on the host.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2279966
Bug Blocks:	2279968

Description Mauro Matteo Cascella 2024-05-10 08:48:44 UTC

A flaw was found in QEMU in the Virtio PCI Bindings (hw/virtio/virtio-pci.c). An improper release and use of the irqfd for vector 0 during the boot process leads to a guest triggerable crash via vhost_net_stop().

The original patch [1] was found to be incomplete and is currently being reworked upstream [2][3].

[1] https://gitlab.com/qemu-project/qemu/-/commit/fcbb086ae590e910614fe5b8bf76e264f71ef304
[2] https://gitlab.com/qemu-project/qemu/-/issues/2321
[3] https://gitlab.com/qemu-project/qemu/-/issues/2334

Comment 1 Mauro Matteo Cascella 2024-05-10 08:49:34 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 2279966]

Comment 3 Mauro Matteo Cascella 2024-06-12 12:58:15 UTC

Upstream commit:
https://gitlab.com/qemu-project/qemu/-/commit/7eeb62b0ce3a8f64647bf53f93903abd1fbb0b94