Use After Free Affecting virt:8.2/qemu-kvm-block-curl package, versions <15:4.2.0-29.module+el8.2.1+13346+415e44e8.10


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.52% (41st percentile)

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  • Snyk IDSNYK-RHEL8-VIRT-4415285
  • published31 Aug 2021
  • disclosed27 Aug 2021

Introduced: 27 Aug 2021

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

How to fix?

Upgrade RHEL:8 virt:8.2/qemu-kvm-block-curl to version 15:4.2.0-29.module+el8.2.1+13346+415e44e8.10 or higher.
This issue was patched in RHSA-2021:5036.

NVD Description

Note: Versions mentioned in the description apply only to the upstream virt:8.2/qemu-kvm-block-curl package and not the virt:8.2/qemu-kvm-block-curl package as distributed by RHEL. See How to fix? for RHEL: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