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CVE-2021-3735

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Date: August 25, 2021

A deadlock issue was found in the AHCI controller device (ich9-ahci) of QEMU while handling a host-to-device Register FIS (Frame Information Structure) packet from the guest. The bug is triggered on a software reset (ahci_reset_port) in the handle_reg_h2d_fis() function [1]. 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.

Language: C

Severity Score

Severity Score

Top Fix

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Upgrade Version

No fix version available

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): HIGH
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): LOW

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