UBUNTU-CVE-2025-38240
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.
02 / AFFECTED SOFTWARE
Affected packages
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6 explicit affected versions
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37 explicit affected versions
8 explicit affected versions
13 explicit affected versions
26 explicit affected versions
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26 explicit affected versions
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29 explicit affected versions
13 explicit affected versions
27 explicit affected versions
27 explicit affected versions
33 explicit affected versions
23 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/106a6de46cf4887d535018185ec528ce822d6d84
- https://git.kernel.org/stable/c/106a6de46cf4887d535018185ec528ce822d6d84
- https://git.kernel.org/stable/c/13ec849fd2eab808ee8eba2625df7ebea3b85edf
- https://git.kernel.org/stable/c/149a5c38436c229950cf1020992ce65c9549bc19
- https://git.kernel.org/stable/c/2fda391ef7a701748abd7fa32232981b522c1e07
- https://git.kernel.org/stable/c/57a9fb47551b33cde7b76d17c0072c3b394f4620
- https://ubuntu.com/security/CVE-2025-38240
- https://ubuntu.com/security/notices/USN-7594-1
- https://ubuntu.com/security/notices/USN-7594-2
- https://ubuntu.com/security/notices/USN-7594-3
- https://ubuntu.com/security/notices/USN-7605-1
- https://ubuntu.com/security/notices/USN-7605-2
- https://ubuntu.com/security/notices/USN-7606-1
- https://ubuntu.com/security/notices/USN-7628-1
- https://ubuntu.com/security/notices/USN-7835-1
- https://ubuntu.com/security/notices/USN-7835-2
- https://ubuntu.com/security/notices/USN-7835-3
- https://ubuntu.com/security/notices/USN-7835-4
- https://ubuntu.com/security/notices/USN-7835-5
- https://ubuntu.com/security/notices/USN-7835-6
- https://ubuntu.com/security/notices/USN-7887-1
- https://ubuntu.com/security/notices/USN-7887-2
- https://ubuntu.com/security/notices/USN-7940-1
- https://ubuntu.com/security/notices/USN-7940-2
- https://www.cve.org/CVERecord?id=CVE-2025-38240