CVE-2021-3682
HIGHQEMU < 6.1.0 - Use-After-Free in USB Redirector Device Emulation
Title source: llmDescription
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.
References (6)
Core 6
Core References
Issue Tracking, Patch, Third Party Advisory x_refsource_misc
https://bugzilla.redhat.com/show_bug.cgi?id=1989651
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20210902-0006/
Third Party Advisory mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2021/09/msg00000.html
Third Party Advisory vendor-advisory
x_refsource_debian
https://www.debian.org/security/2021/dsa-4980
Third Party Advisory vendor-advisory
x_refsource_gentoo
https://security.gentoo.org/glsa/202208-27
Mailing List, Third Party Advisory mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
Scores
CVSS v3
8.5
EPSS
0.0290
EPSS Percentile
85.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Details
CWE
CWE-763
Status
published
Products (6)
debian/debian_linux
9.0
debian/debian_linux
10.0
debian/debian_linux
11.0
qemu/qemu
6.1.0 rc1
qemu/qemu
< 6.1.0
redhat/enterprise_linux
8.0 (2 CPE variants)
Published
Aug 05, 2021
Tracked Since
Feb 18, 2026