PCI: Avoid pci_dev_lock() AB/BA deadlock with sriov_numvfs_store() in Kernel

Kernel Updated 02 Oct 2025

Summary

28/06/2022

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2022-1004064: PCI: Avoid pci_dev_lock() AB/BA deadlock with sriov_numvfs_store(). Affects Kernel versions < da9792920ab525b8a932aa9aeee34529ad7b83f7. No fix is published. How to fix ↓

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Background

The Kernel is a crucial component of the Linux operating system that manages communication between hardware and software. It provides essential functions and services for the proper functioning of the system. The vulnerability identified in the Kernel relates to the pci_dev_lock() function and its interaction with the sriov_numvfs_store() function. This vulnerability can lead to a deadlock scenario, causing potential system instability and denial of service.

Vulnerability Detail

The vulnerability arises due to a deadlock situation caused by the AB/BA locking pattern in the pci_dev_lock() function and the sriov_numvfs_store() function. This can occur when multiple threads or processes attempt to acquire the pci_dev_lock() in different orders, resulting in a deadlock. An attacker could potentially exploit this vulnerability to cause a denial of service by triggering the deadlock scenario. The vulnerability has been addressed in the Linux Kernel version v4.9.318 by commit da9792920ab525b8a932aa9aeee34529ad7b83f7.

How To Fix

No fixed version is published for this vulnerability.

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Workaround

There is no specific workaround mentioned for this vulnerability.

Conclusion

The vulnerability in the Kernel related to the pci_dev_lock() function and sriov_numvfs_store() function can lead to a deadlock scenario, potentially causing system instability and denial of service. It is crucial to update the Linux Kernel to version v4.9.318 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

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