CVE-2021-3735: Debian Linux
Medium severity, CVSS 4.4. EPSS: 0.2% chance of exploitation in the next 30 days.
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.
Affected products
Published 2022-08-26. Last modified 2026-06-17.