Bug 2264844 (CVE-2024-26327)

Summary:	CVE-2024-26327 QEMU: SR-IOV: improper validation of NumVFs leads to buffer overflow
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:	qemu-kvm 9.0.0	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the SR/IOV emulation support of QEMU. The register_vfs() function in hw/pci/pcie_sriov.c mishandled the situation where a guest writes NumVFs greater than TotalVFs, leading to a buffer overflow in VF (Virtual Function) implementations. This flaw allows a malicious guest to crash QEMU and cause a denial of service condition.	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:	2264845
Bug Blocks:	2264850

Description Mauro Matteo Cascella 2024-02-19 09:26:28 UTC

An issue was discovered in QEMU 7.1.0 through 8.2.1. The register_vfs() function in hw/pci/pcie_sriov.c mishandles the situation where a guest writes NumVFs greater than TotalVFs, leading to a buffer overflow in VF implementations.

Reference:
https://lore.kernel.org/all/20240214-reuse-v4-5-89ad093a07f4@daynix.com/

Comment 1 Mauro Matteo Cascella 2024-02-19 09:37:11 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 2264845]

Comment 3 Mauro Matteo Cascella 2024-05-31 11:14:10 UTC

Upstream commit:
https://gitlab.com/qemu-project/qemu/-/commit/6081b4243cd64dff1b2cf5b0c215c71e9d7e753b

Comment 4 errata-xmlrpc 2024-11-12 08:56:00 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:9136 https://access.redhat.com/errata/RHSA-2024:9136