Use After Free Affecting qemu-kvm-hw-usbredir package, versions <15:6.2.0-11.module+el8.6.0+1000+18e3b59f.5


Severity

Recommended
medium

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.52% (41st percentile)

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  • Snyk IDSNYK-ROCKY8-QEMUKVMHWUSBREDIR-3208605
  • published5 Jan 2023
  • disclosed23 Mar 2022

Introduced: 23 Mar 2022

CVE-2021-3748  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:8 qemu-kvm-hw-usbredir to version 15:6.2.0-11.module+el8.6.0+1000+18e3b59f.5 or higher.
This issue was patched in RLSA-2022:1759.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu-kvm-hw-usbredir package and not the qemu-kvm-hw-usbredir package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:8 relevant fixed versions and status.

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 Base Scores

version 3.1