CVE-2026-89885: media: platform: mtk-mdp3: Fix SCP device refcounting

Severity: high (CVSS 8.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-16 · updated 2026-10-19

Description

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 products

Linux kernel: from 6.12.64 before 6.12.110; from 6.18.4 before 6.18.51; 6.19 — fixed in 6.12.110, 6.18.51, 7.3

How to fix

Upgrade to a fixed version: Linux kernel 6.12.110, 6.18.51, 7.3. Check the vendor advisory for mitigations.

References

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