DEBIAN-CVE-2021-3748

Advisory lineage Upstream: 1 Downstream: 3
Upstream
CVE-2021-3748
Published: 23 Mar 2022, 20:15
Last modified:28 Apr 2026, 20:22

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.5 HIGH
3.1 (osv_debian)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

23 Mar 2022, 20:15
Published
Vulnerability first disclosed
28 Apr 2026, 20:22
Last Modified
Vulnerability information updated

Description

A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor's address belongs to the non direct access region, due to num_buffers being set after the virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a denial of service condition, or potentially execute code on the host with the privileges of the QEMU process.

CVSS Metrics

  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected Systems

  • debian•qemu

    < 1:5.2+dfsg-11+deb11u1 | < 1:6.1+dfsg-6 | < 1:6.1+dfsg-6 | < 1:6.1+dfsg-6

References (1)