CVE-2026-93234
UnknownSummary
In the Linux kernel's drm/gud driver, gud_connector_add_tv_mode() passes fixed-size TV mode names directly to the DRM property code. If a device returns an entry without a NUL terminator, strlen() reads past the buffer, causing an out-of-bounds read. The fix validates the NUL terminator and rejects malformed responses with -EIO.
Risk Assessment
May lead to out-of-bounds reads of kernel memory, potentially exposing data or causing system crashes when a malicious or faulty USB device is connected.
Recommendation
Update the Linux kernel to a version containing the drm/gud driver fix. Avoid connecting untrusted USB devices handled by this driver until the update is applied.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS