Medium severity4.4NVD Advisory· Published Aug 26, 2022· Updated Jun 17, 2026

CVE-2021-3735

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

QEMU/Qemu2 versions
cpe:2.3:a:qemu:qemu:6.1.0:rc4:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:qemu:qemu:6.1.0:rc4:*:*:*:*:*:*
- (no CPE)range: Not Known
Debian/linux2 versions
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
QEMU/AHCI controller devicellm-create

Patches

Vulnerability mechanics

References

access.redhat.com/security/cve/CVE-2021-3735nvdThird Party Advisory
bugzilla.redhat.com/show_bug.cginvdIssue TrackingThird Party Advisory
security-tracker.debian.org/tracker/CVE-2021-3735nvdThird Party Advisory
security.netapp.com/advisory/ntap-20250228-0009/nvd

News mentions

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