CVE-2021-3748

A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor's address belongs to the non direct access region, due to num_buffers being set after the virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a denial of service condition, or potentially execute code on the host with the privileges of the QEMU process.

CVSS v3.0 7.5 HIGH
CVSS v2.0 6.9 MEDIUM

7.5^/10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 0.8 / Impact : 6.0

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

6.9^/10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:L/AC:M/Au:N/C:C/I:C/A:C

Exploitability : 3.4 / Impact : 10.0

Access Vector LOCAL

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

References

Link	Resource
https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6	Patch Third Party Advisory
https://ubuntu.com/security/CVE-2021-3748	Patch Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1998514	Issue Tracking Patch Third Party Advisory
https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.html	Mailing List Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html	Mailing List Third Party Advisory
https://security.netapp.com/advisory/ntap-20220425-0004/	Third Party Advisory
https://security.gentoo.org/glsa/202208-27	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html	Mailing List Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR	cpe:2.3:o:debian:debian_linux:9.0:::::::*
	cpe:2.3:o:debian:debian_linux:10.0:::::::*

Configuration 3 (hide)

OR	cpe:2.3:o:canonical:ubuntu_linux:18.04::::lts:::
	cpe:2.3:o:canonical:ubuntu_linux:20.04::::lts:::
	cpe:2.3:o:canonical:ubuntu_linux:21.10:::::::*

Configuration 4 (hide)

cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*

Configuration 5 (hide)

OR	cpe:2.3:o:redhat:enterprise_linux:8.0::::advanced_virtualization:::
	cpe:2.3:o:redhat:enterprise_linux_advanced_virtualization_eus:8.4:::::::*

Information

Published : 2022-03-23 13:15

Updated : 2023-01-03 07:16

NVD link : CVE-2021-3748

Mitre link : CVE-2021-3748

JSON object : View

CWE

CWE-416

Use After Free

Products Affected

redhat

enterprise_linux
enterprise_linux_advanced_virtualization_eus

fedoraproject

fedora

canonical

ubuntu_linux

qemu

qemu

debian

debian_linux

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7.5 /10