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CVE-2022-50221

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: drm/fb-helper: Fix out-of-bounds access Clip memory range to screen-buffer size to avoid out-of-bounds access in fbdev deferred…

Published Jun 18, 2025CWE-125EPSS 0.21%

Overview

CVE-2022-50221 is a high-severity vulnerability. It was published on June 18, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

drm/fb-helper: Fix out-of-bounds access

Clip memory range to screen-buffer size to avoid out-of-bounds access

in fbdev deferred I/O's damage handling.

Fbdev's deferred I/O can only track pages. From the range of pages, the

damage handler computes the clipping rectangle for the display update.

If the fbdev screen buffer ends near the beginning of a page, that page

could contain more scanlines. The damage handler would then track these

non-existing scanlines as dirty and provoke an out-of-bounds access

during the screen update. Hence, clip the maximum memory range to the

size of the screen buffer.

While at it, rename the variables min/max to min_off/max_off in

drm_fb_helper_deferred_io(). This avoids confusion with the macros of

the same name.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/9c49ac792c639dbec0728b513329a32461f72253Refgit.kernel.org/stable/c/ae25885bdf59fde40726863c57fd20e4a0642183

How CyberStrike helps

Frequently asked questions

What is CVE-2022-50221?

CVE-2022-50221 is a high-severity vulnerability. It was published on June 18, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-50221?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-50221?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-50221?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-50221 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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