CVE-2021-22556: Integer Overflow in Fuchsia Kernel
First published: Tue May 03 2022(Updated: )
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.
Credit: cve-coordination@google.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Google Fuchsia | <4.1 |
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Reference Links
Frequently Asked Questions
What is CVE-2021-22556?
CVE-2021-22556 is 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.
How severe is CVE-2021-22556?
CVE-2021-22556 has a severity score of 7.8, which is considered high.
How can I fix CVE-2021-22556?
To fix CVE-2021-22556, it is recommended to upgrade to kernel version 4.1 or beyond.
What is the affected software for CVE-2021-22556?
The affected software for CVE-2021-22556 is Google Fuchsia with versions up to and excluding 4.1.
Where can I find more information about CVE-2021-22556?
More information about CVE-2021-22556 can be found at the following references: [Link 1](https://fuchsia-review.googlesource.com/c/fuchsia/+/570881) and [Link 2](https://fuchsia.dev/whats-new/release-notes/f4-1).
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