CVE-2021-22556 Information

Description

The Security Team discovered an integer overflow bug that allows an attacker with code execution to issue memory cache invalidation operations on pages that they don’t own allowing them to control kernel memory from userspace. We recommend upgrading to kernel version 4.1 or beyond.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

https://fuchsia-review.googlesource.com/c/fuchsia/+/570881 https://fuchsia.dev/whats-new/release-notes/f4-1

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8