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

Official description

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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/676f1fb3632bbc9ce83be7938e93fe6bfc9510fd
• https://git.kernel.org/stable/c/06fcaf21c18ac88f57fee3803554f48c6026b95f
• https://git.kernel.org/stable/c/082e378886547b5b1c4075ed307f7c68547868dc
• https://git.kernel.org/stable/c/70cffc31a380b3eae45027101647aa94c242aa0e
• https://git.kernel.org/stable/c/72a95df6bbc7d20c7af1e39d86b3e910cccd01ad
• https://git.kernel.org/stable/c/eab46d9629807db1b5647d17227e16110a18227f
• https://git.kernel.org/stable/c/da1ea35fea67ad841f4ada28dd61b41be65e5437