Vulnerability Details CVE-2021-3735
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 3.0%
CVSS Severity
CVSS v3 Score 4.4
References
- https://access.redhat.com/security/cve/CVE-2021-3735
- https://bugzilla.redhat.com/show_bug.cgi?id=1997184
- https://security-tracker.debian.org/tracker/CVE-2021-3735
- https://access.redhat.com/security/cve/CVE-2021-3735
- https://bugzilla.redhat.com/show_bug.cgi?id=1997184
- https://security-tracker.debian.org/tracker/CVE-2021-3735
- https://security.netapp.com/advisory/ntap-20250228-0009/
Products affected by CVE-2021-3735
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cpe:2.3:a:qemu:qemu:6.1.0
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cpe:2.3:o:debian:debian_linux:10.0
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cpe:2.3:o:debian:debian_linux:11.0