CVE-2024-36977 usb: dwc3: Wait unconditionally after issuing EndXfer command
A race condition in the Linux kernel DWC3 USB driver can cause SMMU faults and system crashes when stopping active transfers during soft disconnects.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-36977?
CVE-2024-36977 is a high-severity vulnerability in Linux kernel, published on 18 Jun 2024. 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: Wait unconditionally after issuing EndXfer command
Currently all controller IP/revisions except DWC3_usb3 >= 310a wait 1ms unconditionally for ENDXFER completion when IOC is not set. This is because DWC_usb3 controller revisions >= 3.10a supports GUCTL2[14: Rst_actbitlater] bit which allows polling CMDACT bit to know whether ENDXFER command is completed.
Consider a case where an IN request was queued, and parallelly soft_disconnect was called (due to ffs_epfile_release). This eventually calls stop_active_transfer with IOC cleared, hence send_gadget_ep_cmd() skips waiting for CMDACT cleared during EndXfer. For DWC3 controllers with revisions >= 310a, we don't forcefully wait for 1ms either, and we proceed by unmapping the requests. If ENDXFER didn't complete by this time, it leads to SMMU faults since the controller would still be accessing those requests.
Fix this by ensuring ENDXFER completion by adding 1ms delay in __dwc3_stop_active_transfer() unconditionally.
Which versions are affected by CVE-2024-36977?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-36977?
Apply the vendor's patch.
Is CVE-2024-36977 being exploited?
There is no known exploitation of CVE-2024-36977 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-36977, DEBIAN-CVE-2024-36977, GHSA-jghm-p5v7-jx64, UBUNTU-CVE-2024-36977.