CVE-2022-49506: drm/mediatek: Add vblank register/unregister callback functions

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-26 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: Add vblank register/unregister callback functions We encountered a kernel panic issue that callback data will be NULL when it's using in ovl irq handler. There is a timing issue between mtk_disp_ovl_irq_handler() and mtk_ovl_disable_vblank(). To resolve this issue, we use the flow to register/unregister vblank cb: - Register callback function and callback data when crtc creates. - Unregister callback function and callback data when crtc destroies. With this solution, we can assure callback data will not be NULL when vblank is disable.

Affected products

Linux kernel: from 5.12 before 5.15.54; from 5.16 before 5.17.14; from 5.18 before 5.18.3 — fixed in 5.15.54, 5.17.14, 5.18.3

How to fix

Upgrade to a fixed version: Linux kernel 5.15.54, 5.17.14, 5.18.3. Check the vendor advisory for mitigations.

References

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