In the Linux kernel, the following vulnerability has been resolved: USB: dwc2: shut down wakeup timer before freeing HCD state… (CVE-2026-98762)

The vulnerability in the Linux kernel's USB dwc2 driver arises because dwc2_wakeup_detected() can rearm the wakeup timer while the HCD state is still accessible. However, dwc2_hcd_free() deletes the timer only after freeing the host-owned state, and timer_delete() does not synchronize callbacks or prevent the timer from being queued again. This sequencing flaw could lead to use-after-free conditions or other unsafe behavior. The resolution is to stop and shut down the timer earlier in dwc2_hcd_release(), before freeing HCD resources, ensuring no timer callbacks occur after resource release.

The vulnerability could lead to unsafe access to freed resources within the USB dwc2 driver in the Linux kernel, potentially causing system instability or crashes. No known exploits are reported in the wild. The impact is limited to the affected USB driver component and depends on the system's use of the dwc2 USB host controller.

A fix has been implemented to stop and shut down the wakeup timer before freeing the HCD state in the dwc2 driver. Users should update to a Linux kernel version that includes this fix. No additional mitigation steps are indicated.