CVE-2026-93234 — drm/gud: validate TV mode names before creating enum property

Affected: Linux

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

drm/gud: validate TV mode names before creating enum property

The GUD protocol returns TV mode names as fixed-size GUD_CONNECTOR_TV_MODE_NAME_LEN entries and requires each name to be NUL-terminated.

gud_connector_add_tv_mode() currently passes each fixed-size entry directly to drm_mode_create_tv_properties_legacy(), which eventually reaches drm_property_add_enum() and strlen(). If a device returns an entry without a terminating NUL byte, strlen() reads past the end of the slot and can run beyond the allocated buffer, triggering an out-of-bounds read.

Validate that each returned TV mode name contains a NUL terminator within its fixed-size slot before passing it to the DRM property code. If a malformed entry is found, reject the device response with -EIO.

This fixes the out-of-bounds read without changing the handling of valid devices, and avoids silently truncating malformed protocol data.

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CVE-2026-93234 — drm/gud: validate TV mode names before creating enum property