UBUNTU-CVE-2021-3682

Advisory lineage Upstream: 1 Downstream: 2
Upstream
CVE-2021-3682
Published: 05 Aug 2021, 20:15
Last modified:04 Feb 2026, 03:56

Vulnerability Summary

Overall Risk (default)
medium
34/100
CVSS Score
8.5 HIGH
3.1 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

05 Aug 2021, 20:15
Published
Vulnerability first disclosed
04 Feb 2026, 03:56
Last Modified
Vulnerability information updated

Description

A flaw was found in the USB redirector device emulation of QEMU in versions prior to 6.1.0-rc2. It occurs when dropping packets during a bulk transfer from a SPICE client due to the packet queue being full. A malicious SPICE client could use this flaw to make QEMU call free() with faked heap chunk metadata, resulting in a crash of QEMU or potential code execution with the privileges of the QEMU process on the host.

CVSS Metrics

  • v3.1•HIGH•Score: 8.5CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected Systems

  • ubuntu•qemu

    < 2.0.0+dfsg-2ubuntu1.47+esm2 | < 1:2.5+dfsg-5ubuntu10.51+esm1 | < 1:2.11+dfsg-1ubuntu7.39 | < 1:4.2-3ubuntu6.21 | < 1:6.2+dfsg-2ubuntu5

References (4)