CVE-2026-93067
UnknownSummary
In the Linux kernel drm/bridge tc358767 driver, tc_aux_transfer() did not clamp the AUX read size to the request size. The controller could report up to 255 bytes, overflowing the 16-byte auxrdata stack buffer and the caller buffer.
Risk Assessment
A stack buffer overflow can corrupt kernel memory, crash the system, or potentially lead to arbitrary code execution.
Recommendation
Update the Linux kernel to a version with the fix that clamps the reported AUX read size to the request size.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: drm/bridge: tc358767: clamp the reported AUX read size to the request tc_aux_transfer() clamps an AUX read to the payload limit: size_t size = min_t(size_t, DP_AUX_MAX_PAYLOAD_BYTES - 1, msg->size); After the transfer it replaces size with the byte count the controller reports in AUX_BYTES: if (size) size = FIELD_GET(AUX_BYTES, auxstatus); AUX_BYTES is GENMASK(15, 8), so it can be up to 255. Nothing clamps it back to the request. tc_aux_read_data() reads that many bytes into the 16-byte auxrdata stack buffer, then copies them into the caller buffer. A reported count of 255 makes the read run to 256 bytes and overruns both. The controller should never report more than it was asked to transfer, so this is defense in depth rather than a live hole. The reported count is only lightly trusted, and the check is cheap. Clamp it back to the request, the same way ti-sn65dsi86 does in commit aca58eac52b8 ("drm/bridge: ti-sn65dsi86: Never store more than msg->size bytes in AUX xfer").
Vulnerability data from NVD (NIST) · CISA KEV · EPSS