CVE-2026-89885

Summary

In the Linux kernel, the following vulnerability has been resolved:

media: platform: mtk-mdp3: Fix SCP device refcounting

mdp_probe() first tries to get the SCP handle with scp_get(). When that fails, it falls back to looking up the SCP platform device with __get_pdev_by_id() and then reads its driver data.

The fallback lookup returns the platform device with a reference, just like scp_get() does. However, the fallback path currently drops that reference immediately after platform_get_drvdata(). The driver later still calls scp_put(mdp->scp) unconditionally from the probe error path and from mdp_video_device_release(), which drops the SCP device reference again.

Keep the fallback reference until the existing scp_put() call, so that the fallback path follows the same ownership rules as the scp_get() path.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxdb4d27e6bbbf511f9cdb33f682535a0a3cb7c403 < dce13bd9bade3ecc1acb7579397f24743850997faffected
LinuxLinux31ba1a4d7a5d9466f6ef4910a372b8200f8aad19 < 252850653569fdb1a259937e02325cf32c8f0970affected
LinuxLinux8f6f3aa21517ef34d50808af0c572e69580dca20 < 0259ade4c4ceaf1e184a7c1aea8071ad398f9b6faffected
LinuxLinux8f6f3aa21517ef34d50808af0c572e69580dca20 < 55793e4665b7f15151e6f5ab51ca980e73abed5daffected
LinuxLinux6.12.64 < 6.12.110affected
LinuxLinux6.18.4 < 6.18.51affected
LinuxLinux6.19affected
LinuxLinux0 < 6.19unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.5 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References