CVE-2021-3735 — MEDIUM (4.4)

Vulnerability 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.

CVSS Score

4.4

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Qemu	Qemu	6.1.0
Debian	Debian Linux	10.0

Related Weaknesses (CWE)

CWE-667 CWE-400

References

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

FAQ

What is CVE-2021-3735?

CVE-2021-3735 is a vulnerability with a CVSS score of 4.4 (MEDIUM). 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...

How severe is CVE-2021-3735?

CVE-2021-3735 has been rated MEDIUM with a CVSS base score of 4.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-3735?

Check the references section above for vendor advisories and patch information. Affected products include: Qemu Qemu, Debian Debian Linux.