Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.10, < 5.10.241 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/248b061689a40f4fed05252ee2c89f87cf26d7d8Patch
- https://git.kernel.org/stable/c/72e9a1bf9b722628c28092e0c2cd8717edd201dcPatch
- https://git.kernel.org/stable/c/785cc093b6b5a93cc350421a55f3f1eda6585156Patch
- https://git.kernel.org/stable/c/248b061689a40f4fed05252ee2c89f87cf26d7d8Patch
- https://git.kernel.org/stable/c/72e9a1bf9b722628c28092e0c2cd8717edd201dcPatch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
FAQ
What is CVE-2021-47421?
CVE-2021-47421 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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...
How severe is CVE-2021-47421?
CVE-2021-47421 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47421?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.