Use After Free Affecting kernel-rt-modules-extra package, versions <0:4.18.0-305.3.1.rt7.75.el8_4


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-RHEL8-KERNELRTMODULESEXTRA-4037017
  • published26 Jul 2021
  • disclosed29 Apr 2021

Introduced: 29 Apr 2021

CVE-2021-3543  (opens in a new tab)
CWE-416  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade RHEL:8 kernel-rt-modules-extra to version 0:4.18.0-305.3.1.rt7.75.el8_4 or higher.
This issue was patched in RHSA-2021:2169.

NVD Description

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

A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.

CVSS Scores

version 3.1