CVE-2024-56561

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

PCI: endpoint: Fix PCI domain ID release in pci_epc_destroy()

pci_epc_destroy() invokes pci_bus_release_domain_nr() to release the PCI domain ID, but there are two issues:

• epc->dev is passed to pci_bus_release_domain_nr() which was already freed by device_unregister(), leading to a use-after-free issue.

• Domain ID corresponds to the EPC device parent, so passing epc->dev is also wrong.

Fix these issues by passing epc->dev.parent to pci_bus_release_domain_nr() and also do it before device_unregister().

[mani: reworded subject and description]

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

Potential Mitigations

References

• https://git.kernel.org/stable/c/4acc902ed3743edd4ac2d3846604a99d17104359
• https://git.kernel.org/stable/c/c74a1df6c2a2df7dd45c3fc1a5edc29a075dcf22