CVE-2026-64454 usb: dwc3: run gadget disconnect from sleepable suspend context
A locking bug in the Linux kernel DWC3 USB driver causes a kernel panic when a sleepable disconnect callback is invoked during suspend, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64454?
CVE-2026-64454 is a denial of service vulnerability in Linux, published on 25 Jul 2026. 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: dwc3: run gadget disconnect from sleepable suspend context
dwc3_gadget_suspend() takes dwc->lock with IRQs disabled and then calls dwc3_disconnect_gadget(). For async callbacks that helper only uses plain spin_unlock()/spin_lock(), so the gadget ->disconnect() callback still runs with IRQs disabled and any sleepable callback trips Lockdep.
This issue was found by our static analysis tool and then manually reviewed against the current tree.
The grounded PoC kept the dwc3_gadget_suspend() -> dwc3_disconnect_gadget() -> gadget_driver->disconnect() chain, and Lockdep reported:
BUG: sleeping function called from invalid context gadget_disconnect+0x21/0x39 [vuln_msv] dwc3_gadget_suspend.constprop.0+0x2b/0x42 [vuln_msv]
Keep the disconnect callback selection in one common helper, but add a sleepable suspend-side wrapper which snapshots the callback under dwc->lock and then runs it after spin_unlock_irqrestore(). The regular event path still uses the existing spin_unlock()/spin_lock() window.
Which versions are affected by CVE-2026-64454?
How do I fix CVE-2026-64454?
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-2026-64454 being exploited?
There is no known exploitation of CVE-2026-64454 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-64454, DEBIAN-CVE-2026-64454, GHSA-c564-jfpf-wjrh, ROOT-OS-UBUNTU-2204-CVE-2026-64454, UBUNTU-CVE-2026-64454.