CVE-2026-68235

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/amd/display: dce100: skip non-DP stream encoders for DP MST<br /> <br /> On DCE8-class ASICs (e.g. Bonaire), the resource pool contains digital<br /> DIG stream encoders plus one analog DAC encoder. When assigning a stream<br /> encoder for a second DisplayPort MST stream, if the preferred digital<br /> encoder is already acquired, dce100_find_first_free_match_stream_enc_for_link()<br /> falls back to the first free pool entry. That entry may be the analog<br /> encoder, whose funcs table lacks DP hooks such as dp_set_stream_attribute.<br /> The subsequent atomic commit then dereferences NULL function pointers in<br /> link_set_dpms_on() and crashes.<br /> <br /> Skip encoders without dp_set_stream_attribute when the stream uses a DP<br /> signal (including MST). Use dc_is_dp_signal(stream-&gt;signal) for the MST<br /> fallback path instead of checking only the link connector signal.<br /> <br /> Tested on:<br /> - GPU: AMD Radeon R7 260X (Bonaire / DCE8)<br /> - Board: Supermicro C9X299-PG300<br /> - Setup: DP MST daisy chain, hotplug second monitor or have it connected on boot<br /> - Kernel: 7.1.3 (issue observed since 6.19)<br /> - Result: kernel oops without patch; dual monitors stable with patch<br /> <br /> (cherry picked from commit 28ec64943e3ee4d9b8d30cea61e380f1429953a8)