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CVE-2021-47063

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: drm: bridge/panel: Cleanup connector on bridge detach If we don't call drm_connector_cleanup() manually in panel_bridge_detach(…

Published Feb 29, 2024CWE-416EPSS 0.26%

Overview

CVE-2021-47063 is a high-severity vulnerability. It was published on February 29, 2024 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: bridge/panel: Cleanup connector on bridge detach

If we don't call drm_connector_cleanup() manually in

panel_bridge_detach(), the connector will be cleaned up with the other

DRM objects in the call to drm_mode_config_cleanup(). However, since our

drm_connector is devm-allocated, by the time drm_mode_config_cleanup()

will be called, our connector will be long gone. Therefore, the

connector must be cleaned up when the bridge is detached to avoid

use-after-free conditions.

v2: Cleanup connector only if it was created

v3: Add FIXME

v4: (Use connector->dev) directly in if() block

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/18149b420c9bd93c443e8d1f48a063d71d9f6aa1Refgit.kernel.org/stable/c/4d906839d321c2efbf3fed4bc31ffd9ff55b75c0Refgit.kernel.org/stable/c/98d7d76a74e48ec3ddf2e23950adff7edcab9327Refgit.kernel.org/stable/c/ce450934a00cf896e648fde08d0bd1426653d7a2Refgit.kernel.org/stable/c/18149b420c9bd93c443e8d1f48a063d71d9f6aa1Refgit.kernel.org/stable/c/4d906839d321c2efbf3fed4bc31ffd9ff55b75c0Refgit.kernel.org/stable/c/98d7d76a74e48ec3ddf2e23950adff7edcab9327Refgit.kernel.org/stable/c/ce450934a00cf896e648fde08d0bd1426653d7a2

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47063?

CVE-2021-47063 is a high-severity vulnerability. It was published on February 29, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47063?

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-2021-47063?

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-2021-47063?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47063 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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