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CVE-2021-3735

MEDIUM
4.4
CVSS Score
Published: August 26, 2022 at 03:25 PM UTC
Updated: June 17, 2026 at 04:05 AM UTC
2 products affected across 2 vendorsDebian LinuxQEMU

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Severity
MEDIUM4.4
Exploit prediction
EPSS 0.2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

x_refsource_MISCThird Party Advisory
Source: [email protected]
https://access.redhat.com/security/cve/CVE-2021-3735
x_refsource_MISCIssue TrackingThird Party Advisory
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=1997184
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://security-tracker.debian.org/tracker/CVE-2021-3735
Source: af854a3a-2127-422b-91ae-364da2661108
https://security.netapp.com/advisory/ntap-20250228-0009/

CVSS

4.4MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-667CWE-400

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