CVE-2021-3682
8.5 HIGHA flaw was found in the USB redirector device emulation of QEMU in versions prior to 6.1.0-rc2
Published: 2021-08-05 · Last updated: 2026-06-17
Severity and scoring
- CVSS
- 8.5 HIGH
- Vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- CWE
- CWE-763
Affected products
| Vendor | Product |
|---|---|
| debian | debian_linux, enterprise_linux, qemu |
| qemu | debian_linux, enterprise_linux, qemu |
| redhat | debian_linux, enterprise_linux, qemu |
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2021-3682
- [Patch]https://bugzilla.redhat.com/show_bug.cgi?id=1989651
- [Other]https://lists.debian.org/debian-lts-announce/2021/09/msg00000.html
- [Other]https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
- [Other]https://security.gentoo.org/glsa/202208-27
- [Other]https://security.netapp.com/advisory/ntap-20210902-0006/
- [Other]https://www.debian.org/security/2021/dsa-4980
- [Patch]https://bugzilla.redhat.com/show_bug.cgi?id=1989651
- [Other]https://lists.debian.org/debian-lts-announce/2021/09/msg00000.html
- [Other]https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
- [Other]https://security.gentoo.org/glsa/202208-27
- [Other]https://security.netapp.com/advisory/ntap-20210902-0006/
- [Other]https://www.debian.org/security/2021/dsa-4980
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