Loop with Unreachable Exit Condition ('Infinite Loop') Affecting virt-devel:rhel/libnbd package, versions <0:1.2.2-1.module+el8.3.0+7353+9de0a3cc


Severity

Recommended
0.0
low
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.05% (16th percentile)

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  • Snyk IDSNYK-RHEL8-VIRTDEVEL-4988756
  • published26 Jul 2021
  • disclosed10 Feb 2021

Introduced: 10 Feb 2021

CVE-2021-20257  (opens in a new tab)
CWE-835  (opens in a new tab)

How to fix?

Upgrade RHEL:8 virt-devel:rhel/libnbd to version 0:1.2.2-1.module+el8.3.0+7353+9de0a3cc or higher.
This issue was patched in RHSA-2021:5238.

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.

An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid values. This flaw allows a guest to consume CPU cycles on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

CVSS Scores

version 3.1