# CVE-2025-68287: usb: dwc3: Fix race condition between concurrent dwc3_remove_requests() call paths

> A race condition in the Linux kernel DWC3 USB driver allows local attackers to cause a system crash via use-after-free during concurrent USB request removal.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 16 Dec 2025
- **Updated:** 16 Jun 2026
- **Also known as:** BELL-CVE-2025-68287, DEBIAN-CVE-2025-68287, GHSA-23wc-qh4p-pmrr, ROOT-OS-DEBIAN-12-CVE-2025-68287, ROOT-OS-DEBIAN-13-CVE-2025-68287, ROOT-OS-UBUNTU-2204-CVE-2025-68287, ROOT-OS-UBUNTU-2404-CVE-2025-68287, UBUNTU-CVE-2025-68287

## What is CVE-2025-68287?

CVE-2025-68287 is a vulnerability in Linux, published on 16 Dec 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: dwc3: Fix race condition between concurrent dwc3_remove_requests() call paths

This patch addresses a race condition caused by unsynchronized
execution of multiple call paths invoking `dwc3_remove_requests()`,
leading to premature freeing of USB requests and subsequent crashes.

Three distinct execution paths interact with `dwc3_remove_requests()`:
Path 1:
Triggered via `dwc3_gadget_reset_interrupt()` during USB reset
handling. The call stack includes:
- `dwc3_ep0_reset_state()`
- `dwc3_ep0_stall_and_restart()`
- `dwc3_ep0_out_start()`
- `dwc3_remove_requests()`
- `dwc3_gadget_del_and_unmap_request()`

Path 2:
Also initiated from `dwc3_gadget_reset_interrupt()`, but through
`dwc3_stop_active_transfers()`. The call stack includes:
- `dwc3_stop_active_transfers()`
- `dwc3_remove_requests()`
- `dwc3_gadget_del_and_unmap_request()`

Path 3:
Occurs independently during `adb root` execution, which triggers
USB function unbind and bind operations. The sequence includes:
- `gserial_disconnect()`
- `usb_ep_disable()`
- `dwc3_gadget_ep_disable()`
- `dwc3_remove_requests()` with `-ESHUTDOWN` status

Path 3 operates asynchronously and lacks synchronization with Paths
1 and 2. When Path 3 completes, it disables endpoints and frees 'out'
requests. If Paths 1 or 2 are still processing these requests,
accessing freed memory leads to a crash due to use-after-free conditions.

To fix this added check for request completion and skip processing
if already completed and added the request status for ep0 while queue.

## Which versions are affected by CVE-2025-68287?


## How do I fix CVE-2025-68287?

Apply the vendor's patch.

## Is CVE-2025-68287 being exploited?

There is no known exploitation of CVE-2025-68287 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-68287 and fix it if it is affected.

What it is: CVE-2025-68287 is a vulnerability in Linux, published on 16 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-68287 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-68287/ (Markdown: https://insights.sbomify.com/CVE-2025-68287/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-68287
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-68287
- OSV: https://osv.dev/vulnerability/CVE-2025-68287

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-68287/
Summaries are generated and may contain mistakes; the official description above is the record.