Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
High
Attack Vector
Local
0

CVE-2021-3748

Disclosure Date: March 23, 2022 •
CVE-2021-3748 CVSS v3 Base Score: 7.5
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

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.

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CVSS V3 Severity and Metrics
Base Score:
7.5 High
Impact Score:
6
Exploitability Score:
0.8
Vector:
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack Vector (AV):
Local
Attack Complexity (AC):
High
Privileges Required (PR):
High
User Interaction (UI):
None
Scope (S):
Changed
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
QEMU (virtio-net) Affects qemu v0.10.0 and above, Fixed In – v6.2.0-rc0 and above.
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • canonical,
  • debian,
  • fedoraproject,
  • qemu,
  • redhat

Products

  • debian linux 10.0,
  • debian linux 9.0,
  • enterprise linux 8.0,
  • enterprise linux advanced virtualization eus 8.4,
  • fedora 34,
  • qemu,
  • ubuntu linux 18.04,
  • ubuntu linux 20.04,
  • ubuntu linux 21.10
Technical Analysis