CVE-2024-53152

/// Technical description

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

PCI: tegra194: Move controller cleanups to pex_ep_event_pex_rst_deassert()

Currently, the endpoint cleanup function dw_pcie_ep_cleanup() and EPF

deinit notify function pci_epc_deinit_notify() are called during the

execution of pex_ep_event_pex_rst_assert() i.e., when the host has asserted

PERST#. But quickly after this step, refclk will also be disabled by the

host.

All of the tegra194 endpoint SoCs supported as of now depend on the refclk

from the host for keeping the controller operational. Due to this

limitation, any access to the hardware registers in the absence of refclk

will result in a whole endpoint crash. Unfortunately, most of the

controller cleanups require accessing the hardware registers (like eDMA

cleanup performed in dw_pcie_ep_cleanup(), etc...). So these cleanup

functions can cause the crash in the endpoint SoC once host asserts PERST#.

One way to address this issue is by generating the refclk in

/// 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