Description

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

drm/mediatek: dp: drm_err => dev_err in HPD path to avoid NULL ptr

The function mtk_dp_wait_hpd_asserted() may be called before the
`mtk_dp->drm_dev` pointer is assigned in mtk_dp_bridge_attach().
Specifically it can be called via this callpath:
- mtk_edp_wait_hpd_asserted
- [panel probe]
- dp_aux_ep_probe

Using "drm" level prints anywhere in this callpath causes a NULL
pointer dereference. Change the error message directly in
mtk_dp_wait_hpd_asserted() to dev_err() to avoid this. Also change the
error messages in mtk_dp_parse_capabilities(), which is called by
mtk_dp_wait_hpd_asserted().

While touching these prints, also add the error code to them to make
future debugging easier.

Classification

CVE ID: CVE-2025-38240

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.02% (probability of being exploited)

EPSS Percentile: 3.08% (scored less or equal to compared to others)

EPSS Date: 2025-04-18 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-38240
https://git.kernel.org/stable/c/13ec849fd2eab808ee8eba2625df7ebea3b85edf
https://git.kernel.org/stable/c/57a9fb47551b33cde7b76d17c0072c3b394f4620
https://git.kernel.org/stable/c/2fda391ef7a701748abd7fa32232981b522c1e07
https://git.kernel.org/stable/c/149a5c38436c229950cf1020992ce65c9549bc19
https://git.kernel.org/stable/c/106a6de46cf4887d535018185ec528ce822d6d84

Timeline