Out-of-bounds Write Affecting perf package, versions <0:4.18.0-372.70.1.el8_6


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.08% (35th percentile)

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  • Snyk IDSNYK-RHEL8-PERF-5873153
  • published21 Jul 2022
  • disclosed5 Jan 2021

Introduced: 5 Jan 2021

CVE-2021-33656  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade RHEL:8 perf to version 0:4.18.0-372.70.1.el8_6 or higher.
This issue was patched in RHSA-2023:4789.

NVD Description

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

When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.

CVSS Scores

version 3.1