Resource exhaustion in Qemu
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (9.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Qemu — versions 6.1.0
- Debian Linux — versions 10.0, 11.0
- Qemu — versions Not Known
Weakness classification (CWE)
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- access.redhat.com/security/cve/CVE-2021-3735 (Third Party Advisory)
- security-tracker.debian.org/tracker/CVE-2021-3735 (Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2021-3735?
- CVE-2021-3735 is a medium-severity vulnerability in Qemu, classified under Improper Locking. CVSS score: 4.4/10. Published 2022-08-26.
- How severe is CVE-2021-3735?
- Medium severity. CVSS v3 base score is 4.4 out of 10.