CVE-2024-58093

Technical Description

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

PCI/ASPM: Fix link state exit during switch upstream function removal

Before 456d8aa37d0f ("PCI/ASPM: Disable ASPM on MFD function removal to

avoid use-after-free"), we would free the ASPM link only after the last

function on the bus pertaining to the given link was removed.

That was too late. If function 0 is removed before sibling function,

link->downstream would point to free'd memory after.

After above change, we freed the ASPM parent link state upon any function

removal on the bus pertaining to a given link.

That is too early. If the link is to a PCIe switch with MFD on the upstream

port, then removing functions other than 0 first would free a link which

still remains parent_link to the remaining downstream ports.

The resulting GPFs are especially frequent during hot-unplug, because

pciehp removes devices on the link bus in reverse order.

On that switch, function 0 is the virtual P2P bridge to the internal

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

References