CVE-2025-40316

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux7d98166183d627c0b9daca7672b2191fae0f8a03 < a5a896f8315de358a2932e2c23c42d550256046aaffected
LinuxLinux31ce7c089b50c3d3056c37e0e25e7535e4428ae1 < 0142fe895986addf35885b43440718e567121155affected
LinuxLinux1f403699c40f0806a707a9a6eed3b8904224021a < 8ba827e09eb586e952d10e39406fa02d10bb591eaffected
LinuxLinux1f403699c40f0806a707a9a6eed3b8904224021a < 926d002e6d7e2f1fd5c1b53cf6208153ee7d380daffected
LinuxLinuxfae58d0155a979a8c414bbc12db09dd4b2f910d0affected
LinuxLinux6.6.105 < 6.6.117affected
LinuxLinux6.12.45 < 6.12.58affected
LinuxLinux6.16.5 < 6.17affected
LinuxLinux6.17affected
LinuxLinux0 < 6.17unaffected
LinuxLinux6.6.117 <= 6.6.*unaffected
LinuxLinux6.12.58 <= 6.12.*unaffected
LinuxLinux6.17.8 <= 6.17.*unaffected
LinuxLinux6.18 <= *unaffected

Weaknesses

References