Vulnerability Monitor

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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.

Published

2022-03-23T20:15:09.893

Last Modified

2024-11-21T06:22:19.667

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

CVSSv2 Vector

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

Access Vector: LOCAL
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: COMPLETE
Integrity Impact: COMPLETE
Availability Impact: COMPLETE

Exploitability Score

3.4

Impact Score

10.0

Weaknesses

Type: Secondary
CWE-416
Type: Primary
CWE-416

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	qemu	qemu	< 6.2.0	Yes
Operating System	debian	debian_linux	9.0	Yes
Operating System	debian	debian_linux	10.0	Yes
Operating System	canonical	ubuntu_linux	18.04	Yes
Operating System	canonical	ubuntu_linux	20.04	Yes
Operating System	canonical	ubuntu_linux	21.10	Yes
Operating System	fedoraproject	fedora	34	Yes
Operating System	redhat	enterprise_linux	8.0	Yes
Operating System	redhat	enterprise_linux_advanced_virtualization_eus	8.4	Yes

References

https://bugzilla.redhat.com/show_bug.cgi?id=1998514 Issue Tracking, Patch, Third Party Advisory ([email protected])
https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6 Patch, Third Party Advisory ([email protected])
https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html Mailing List, Third Party Advisory ([email protected])
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html Mailing List, Third Party Advisory ([email protected])
https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.html Mailing List, Patch, Third Party Advisory ([email protected])
https://security.gentoo.org/glsa/202208-27 Third Party Advisory ([email protected])
https://security.netapp.com/advisory/ntap-20220425-0004/ Third Party Advisory ([email protected])
https://ubuntu.com/security/CVE-2021-3748 Patch, Third Party Advisory ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=1998514 Issue Tracking, Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.html Mailing List, Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/202208-27 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20220425-0004/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://ubuntu.com/security/CVE-2021-3748 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)