CVE-2024-53152 PCI: tegra194: Move controller cleanups to pex_ep_event_pex_rst_deassert()

What is CVE-2024-53152?

CVE-2024-53152 is a medium-severity denial of service vulnerability in Linux kernel, published on 24 Dec 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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 the endpoint itself and not depending on the host. But that is not always possible as some of the endpoint designs do require the endpoint to consume refclk from the host.

Thus, fix this crash by moving the controller cleanups to the start of the pex_ep_event_pex_rst_deassert() function. This function is called whenever the host has deasserted PERST# and it is guaranteed that the refclk would be active at this point. So at the start of this function (after enabling resources) the controller cleanup can be performed. Once finished, rest of the code execution for PERST# deassert can continue as usual.

Which versions are affected by CVE-2024-53152?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-53152?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2024-53152 being exploited?

There is no known exploitation of CVE-2024-53152 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

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• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2024-53152, DEBIAN-CVE-2024-53152, GHSA-vhcm-pjgm-q2wv, UBUNTU-CVE-2024-53152.