VulnerabilityModified
CVE-2021-3735
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.
MEDIUM 4.4EPSS 0.20%
Does this matter?
Lower severity and a low EPSS score (0.20%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 4.4 MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.20% probability · 10th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-667, CWE-400
- Affected
- qemu/qemu · debian/debian linux
- Source
- secalert@redhat.com
References
- https://access.redhat.com/security/cve/CVE-2021-3735Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1997184Issue Tracking, Third 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 Tracking, Third Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2021-3735Third Party Advisory
- https://security.netapp.com/advisory/ntap-20250228-0009/
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.