Medium severity · published Aug 26, 2022
CVE-2021-3735
A deadlock issue was found in the AHCI controller device of QEMU
4.4
CVSS
0.2%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DL
Debian Linux · Debian
10.0; 11.0 · source: NVD
QE
Qemu · Qemu
6.1.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3735
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-3735
Third Party Advisory
https://access.redhat.com/security/cve/CVE-2021-3735
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=1997184
Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2021-3735
security.netapp.com
https://security.netapp.com/advisory/ntap-20250228-0009/
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