CVE-2021-3735

MEDIUM

QEMU - Denial of Service via AHCI Controller Deadlock

Title source: llm
STIX 2.1

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.

References (4)

Core 4
Core References
Issue Tracking, Third Party Advisory x_refsource_misc
https://bugzilla.redhat.com/show_bug.cgi?id=1997184
Third Party Advisory x_refsource_misc
https://access.redhat.com/security/cve/CVE-2021-3735
Third Party Advisory x_refsource_misc
https://security-tracker.debian.org/tracker/CVE-2021-3735

Scores

CVSS v3 4.4
EPSS 0.0013
EPSS Percentile 31.9%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-667 CWE-400
Status published
Products (3)
debian/debian_linux 10.0
debian/debian_linux 11.0
qemu/qemu 6.1.0 rc4
Published Aug 26, 2022
Tracked Since Feb 18, 2026