Use After Free Affecting firefox package, versions <0:91.3.0-1.el8_4


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.29% (70th percentile)

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  • Snyk IDSNYK-RHEL8-FIREFOX-4102061
  • published23 Feb 2022
  • disclosed2 Nov 2021

Introduced: 2 Nov 2021

CVE-2021-43535  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade RHEL:8 firefox to version 0:91.3.0-1.el8_4 or higher.
This issue was patched in RHSA-2021:4123.

NVD Description

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

A use-after-free could have occured when an HTTP2 session object was released on a different thread, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, Thunderbird < 91.3, and Firefox ESR < 91.3.

CVSS Scores

version 3.1