CVE-2024-42085: 
Linux Kernel vulnerability analysis and mitigation

CVE-2024-42085 affects the Linux kernel's USB DWC3 (DesignWare USB3) driver, specifically when CONFIGUSBDWC3DUALROLE is selected. The vulnerability was discovered and disclosed in July 2024, affecting Linux kernel versions from 5.15.128 up to 6.9.8 (NVD).

The vulnerability stems from improper locking in the USB DWC3 driver during gadget suspend/resume operations. When triggering system suspend with 'echo mem > /sys/power/state', a deadlock occurs due to redundant lock of OTG mode. The issue manifests in dwc3suspendcommon() where a spinlock is acquired twice: first at the function entry and again during gadget operations (Kernel Patch). The vulnerability has been assigned a CVSS v3.1 Base Score of 5.5 MEDIUM (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) (NVD).

The vulnerability can result in a deadlock condition in the Linux kernel's USB subsystem. When exploited, it can cause a denial of service by freezing the system during suspend operations on devices using the DWC3 USB controller in dual-role mode (NVD).

The issue has been fixed by removing the redundant lock of OTG mode during gadget suspend/resume operations. The fix is included in Linux kernel updates, and users should upgrade to patched versions: Linux 5.15.162 or later, 6.1.97 or later, 6.6.37 or later, or 6.9.8 or later (Kernel Patch).