Use After Free Affecting virt:rhel/virt-dib package, versions <1:1.44.0-5.module_el8.6.0+2880+7d9e3703.alma


Severity

Recommended
medium

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.01% (2nd percentile)

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  • Snyk IDSNYK-ALMALINUX8-VIRT-5728061
  • published28 May 2023
  • disclosed10 May 2022

Introduced: 10 May 2022

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

How to fix?

Upgrade AlmaLinux:8 virt:rhel/virt-dib to version 1:1.44.0-5.module_el8.6.0+2880+7d9e3703.alma or higher.
This issue was patched in ALSA-2022:1759.

NVD Description

Note: Versions mentioned in the description apply only to the upstream virt:rhel/virt-dib package and not the virt:rhel/virt-dib package as distributed by AlmaLinux. See How to fix? for AlmaLinux: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