CVE-2025-37843

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

PCI: pciehp: Avoid unnecessary device replacement check

Hot-removal of nested PCI hotplug ports suffers from a long-standing race

condition which can lead to a deadlock: A parent hotplug port acquires

pci_lock_rescan_remove(), then waits for pciehp to unbind from a child

hotplug port. Meanwhile that child hotplug port tries to acquire

pci_lock_rescan_remove() as well in order to remove its own children.

The deadlock only occurs if the parent acquires pci_lock_rescan_remove()

first, not if the child happens to acquire it first.

Several workarounds to avoid the issue have been proposed and discarded

over the years, e.g.:

https://lore.kernel.org/r/4c882e25194ba8282b78fe963fec8faae7cf23eb.1529173804.git.lukas@wunner.de/

A proper fix is being worked on, but needs more time as it is nontrivial

and necessarily intrusive.

Recent commit 9d573d19547b ("PCI: pciehp: Detect device replacement during

system sleep") provoke

/// 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