VULNERABILITY INTELLIGENCE

CVE-2021-3735

CVSS score4.4 MEDIUM
EPSS probability0.21%
CISA KEVNot currently listed
Published2022-08-26
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Description

A deadlock issue was found in the AHCI controller device of QEMU. It occurs on a software reset (ahci_reset_port) while handling a host-to-device Register FIS (Frame Information Structure) packet from the guest. A privileged user inside the guest could use this flaw to hang the QEMU process on the host, resulting in a denial of service condition. The highest threat from this vulnerability is to system availability.

Weakness classification

  • secalert@redhat.com: CWE-667
  • nvd@nist.gov: CWE-400

Primary references