CVE-2026-64478

01/Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: avoid kobject path lookup in DualSense match The DualSense jack-detection input handler verifies that a matching input device belongs to the same physical controller by building kobject path strings for both the input device and the USB audio device, then comparing the path prefix. This was observed when a weak physical connection caused the controller to rapidly disconnect and reconnect. During that repeated hotplug, snd_dualsense_ih_match() can run while the controller's USB device is being disconnected. kobject_get_path() walks ancestor kobjects and dereferences their names; if the USB device kobject name is no longer valid, this can fault in strlen(): RIP: 0010:strlen+0x10/0x30 Call Trace: kobject_get_path+0x34/0x150 snd_dualsense_ih_match+0x49/0xd0 [snd_usb_audio] input_register_device+0x566/0x6a0 ps_probe+0xb89/0x1590 [hid_playstation] The same ownership check can be done without building kobject path strings. The input device is parented below the HID device, USB interface and USB device, so walking the input device parent chain and comparing against the mixer USB device preserves the check without dereferencing kobject names during disconnect.

02/Affected products

linux: linux kernel

03/References8

• git.kernel.org/stable/c/4246dd043b7a4f8e3bc1d2896e81d11220610eda Patch
• git.kernel.org/stable/c/4566bf8ae9dbfe81bdc2ff1702d59db8a233b06e Patch
• git.kernel.org/stable/c/662a1d7b5affc424ea4f4bc20dd99be29e687886 Patch
• git.kernel.org/stable/c/7693c0cc415f3a16a7a3355f245474a5e661be4e Patch
• git.kernel.org/stable/c/a263eb12cbe2e208e6e637df0f9b0be9a484158e Patch
• git.kernel.org/stable/c/a47ecd904c51ae6a42957feb3cf2f4266adee2e5 Patch
• git.kernel.org/stable/c/c1da6d3f45036fa63672ee04ad97cb526b40b987 Patch
• git.kernel.org/stable/c/e4c66a149c408e44e60bfec3fabf08b6b7abbc60 Patch