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CVE-2021-47200

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: drm/prime: Fix use after free in mmap with drm_gem_ttm_mmap drm_gem_ttm_mmap() drops a reference to the gem object on success.

Published Apr 10, 2024CWE-416EPSS 0.22%

Overview

CVE-2021-47200 is a high-severity vulnerability. It was published on April 10, 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/prime: Fix use after free in mmap with drm_gem_ttm_mmap

drm_gem_ttm_mmap() drops a reference to the gem object on success. If

the gem object's refcount == 1 on entry to drm_gem_prime_mmap(), that

drop will free the gem object, and the subsequent drm_gem_object_get()

will be a UAF. Fix by grabbing a reference before calling the mmap

helper.

This issue was forseen when the reference dropping was adding in

commit 9786b65bc61ac ("drm/ttm: fix mmap refcounting"):

"For that to work properly the drm_gem_object_get() call in

drm_gem_ttm_mmap() must be moved so it happens before calling

obj->funcs->mmap(), otherwise the gem refcount would go down

to zero."

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/4f8e469a2384dfa4047145b0093126462cbb6dc0Refgit.kernel.org/stable/c/8244a3bc27b3efd057da154b8d7e414670d5044fRefgit.kernel.org/stable/c/4f8e469a2384dfa4047145b0093126462cbb6dc0Refgit.kernel.org/stable/c/8244a3bc27b3efd057da154b8d7e414670d5044f

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47200?

CVE-2021-47200 is a high-severity vulnerability. It was published on April 10, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47200?

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-2021-47200?

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-2021-47200?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47200 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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