CVE-2026-89885

8.4 HIGH

Published 2026-09-16 · Updated 2026-09-16

AI risk analysis

Summary: The flaw involves improper reference counting of the SCP device in the mtk-mdp3 driver, leading to potential double-free conditions.
Exploitability: Exploitation requires the attacker to trigger the fallback path in the driver, which is conditional and may be difficult to reliably trigger.
Blast radius: If exploited, this could lead to kernel crashes or privilege escalation, impacting the system's stability and security.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to the fixed version 5.19.59 or later.

kernelreference-countingstability

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Data: NVD (public domain). Analysis: local $0 model. Defensive use only.