CVE-2025-38134 usb: acpi: Prevent null pointer dereference in usb_acpi_add_usb4_devlink()

What is CVE-2025-38134?

CVE-2025-38134 is a medium-severity vulnerability in Linux kernel, published on 3 Jul 2025. 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:

usb: acpi: Prevent null pointer dereference in usb_acpi_add_usb4_devlink()

As demonstrated by the fix for update_port_device_state, commit 12783c0b9e2c ("usb: core: Prevent null pointer dereference in update_port_device_state"), usb_hub_to_struct_hub() can return NULL in certain scenarios, such as during hub driver unbind or teardown race conditions, even if the underlying usb_device structure exists.

Plus, all other places that call usb_hub_to_struct_hub() in the same file do check for NULL return values.

If usb_hub_to_struct_hub() returns NULL, the subsequent access to hub->ports[udev->portnum - 1] will cause a null pointer dereference.

Weakness: CWE-476

Which versions are affected by CVE-2025-38134?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2025-38134?

Apply the vendor's patch.

Is CVE-2025-38134 being exploited?

There is no known exploitation of CVE-2025-38134 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• 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-2025-38134, DEBIAN-CVE-2025-38134, GHSA-jx2w-33ww-4xjr, UBUNTU-CVE-2025-38134.