Use After Free Affecting kernel-rt-debug-kvm package, versions <0:4.18.0-348.rt7.130.el8


Severity

Recommended
medium

Based on CentOS security rating.

Threat Intelligence

EPSS
0.09% (38th percentile)

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  • Snyk IDSNYK-CENTOS8-KERNELRTDEBUGKVM-2126805
  • published26 Jul 2021
  • disclosed4 Mar 2021

Introduced: 4 Mar 2021

CVE-2021-33033  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Centos:8 kernel-rt-debug-kvm to version 0:4.18.0-348.rt7.130.el8 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-kvm package and not the kernel-rt-debug-kvm package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.

CVSS Scores

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