CVE-2021-3735
low-risk
Published 2022-08-26
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.
Do I need to act?
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0.13% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.4/10
Medium
LOCAL
/ LOW complexity
Affected Products (3)
References (7)
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
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
25
/ 100
low-risk
Severity
15/34 · Moderate
Exploitability
1/34 · Minimal
Exposure
9/34 · Low