NULL Pointer Dereference Affecting virt-devel:rhel/libnbd package, versions <0:1.6.0-5.module+el8.6.0+14480+c0a3aa0f


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.06% (26th percentile)

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  • Snyk IDSNYK-RHEL8-VIRTDEVEL-4268226
  • published26 Jul 2021
  • disclosed23 Jan 2021

Introduced: 23 Jan 2021

CVE-2021-20196  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade RHEL:8 virt-devel:rhel/libnbd to version 0:1.6.0-5.module+el8.6.0+14480+c0a3aa0f or higher.
This issue was patched in RHSA-2022:1759.

NVD Description

Note: Versions mentioned in the description apply only to the upstream virt-devel:rhel/libnbd package and not the virt-devel:rhel/libnbd package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

A NULL pointer dereference flaw was found in the floppy disk emulator of QEMU. This issue occurs while processing read/write ioport commands if the selected floppy drive is not initialized with a block device. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

CVSS Scores

version 3.1