CVE-2025-37882 usb: xhci: Fix isochronous Ring Underrun/Overrun event handling
A race condition in the Linux kernel xHCI driver can lead to use-after-free, potentially allowing code execution or system crashes.
- 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-2025-37882?
CVE-2025-37882 is a high-severity use after free vulnerability in Linux kernel, published on 9 May 2025. 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: xhci: Fix isochronous Ring Underrun/Overrun event handling
The TRB pointer of these events points at enqueue at the time of error occurrence on xHCI 1.1+ HCs or it's NULL on older ones. By the time we are handling the event, a new TD may be queued at this ring position.
I can trigger this race by rising interrupt moderation to increase IRQ handling delay. Similar delay may occur naturally due to system load.
If this ever happens after a Missed Service Error, missed TDs will be skipped and the new TD processed as if it matched the event. It could be given back prematurely, risking data loss or buffer UAF by the xHC.
Don't complete TDs on xrun events and don't warn if queued TDs don't match the event's TRB pointer, which can be NULL or a link/no-op TRB. Don't warn if there are no queued TDs at all.
Now that it's safe, also handle xrun events if the skip flag is clear. This ensures completion of any TD stuck in 'error mid TD' state right before the xrun event, which could happen if a driver submits a finite number of URBs to a buggy HC and then an error occurs on the last TD.
Weakness: CWE-416
Which versions are affected by CVE-2025-37882?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-37882?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2025-37882 being exploited?
There is no known exploitation of CVE-2025-37882 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-62753, AZL-70159, BELL-CVE-2025-37882, DEBIAN-CVE-2025-37882, GHSA-3qx6-96c8-pv99, ROOT-OS-DEBIAN-11-CVE-2025-37882 and 4 more.