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CVE-2021-47421

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: handle the case of pci_channel_io_frozen only in amdgpu_pci_resume In current code, when a PCI error state pci_chan…

Published May 21, 2024CWE-667EPSS 0.21%

Overview

CVE-2021-47421 is a high-severity vulnerability. It was published on May 21, 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/amdgpu: handle the case of pci_channel_io_frozen only in amdgpu_pci_resume

In current code, when a PCI error state pci_channel_io_normal is detectd,

it will report PCI_ERS_RESULT_CAN_RECOVER status to PCI driver, and PCI

driver will continue the execution of PCI resume callback report_resume by

pci_walk_bridge, and the callback will go into amdgpu_pci_resume

finally, where write lock is releasd unconditionally without acquiring

such lock first. In this case, a deadlock will happen when other threads

start to acquire the read lock.

To fix this, add a member in amdgpu_device strucutre to cache

pci_channel_state, and only continue the execution in amdgpu_pci_resume

when it's pci_channel_io_frozen.

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/248b061689a40f4fed05252ee2c89f87cf26d7d8Refgit.kernel.org/stable/c/72e9a1bf9b722628c28092e0c2cd8717edd201dcRefgit.kernel.org/stable/c/785cc093b6b5a93cc350421a55f3f1eda6585156Refgit.kernel.org/stable/c/248b061689a40f4fed05252ee2c89f87cf26d7d8Refgit.kernel.org/stable/c/72e9a1bf9b722628c28092e0c2cd8717edd201dcReflists.debian.org/debian-lts-announce/2025/10/msg00007.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47421?

CVE-2021-47421 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47421?

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-2021-47421?

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-2021-47421?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47421 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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