CVE-2021-3735

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.

• CWE-667
• CWE-400
• CWE-667

• https://access.redhat.com/security/cve/CVE-2021-3735Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1997184Issue Tracking, Third Party Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-3735Third Party Advisory
• https://access.redhat.com/security/cve/CVE-2021-3735Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1997184Issue Tracking, Third Party Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-3735Third Party Advisory
• https://security.netapp.com/advisory/ntap-20250228-0009/

Published

Aug 26, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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