{"id":"DEBIAN-CVE-2025-40148","details":"In the Linux kernel, the following vulnerability has been resolved:  drm/amd/display: Add NULL pointer checks in dc_stream cursor attribute functions  The function dc_stream_set_cursor_attributes() currently dereferences the `stream` pointer and nested members `stream-\u003ectx-\u003edc-\u003ecurrent_state` without checking for NULL.  All callers of these functions, such as in `dcn30_apply_idle_power_optimizations()` and `amdgpu_dm_plane_handle_cursor_update()`, already perform NULL checks before calling these functions.  Fixes below: drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:336 dc_stream_program_cursor_attributes() error: we previously assumed 'stream' could be null (see line 334)  drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c     327 bool dc_stream_program_cursor_attributes(     328         struct dc_stream_state *stream,     329         const struct dc_cursor_attributes *attributes)     330 {     331         struct dc  *dc;     332         bool reset_idle_optimizations = false;     333     334         dc = stream ? stream-\u003ectx-\u003edc : NULL;                      ^^^^^^ The old code assumed stream could be NULL.      335 --\u003e 336         if (dc_stream_set_cursor_attributes(stream, attributes)) {                                                     ^^^^^^ The refactor added an unchecked dereference.  drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c    313  bool dc_stream_set_cursor_attributes(    314          struct dc_stream_state *stream,    315          const struct dc_cursor_attributes *attributes)    316  {    317          bool result = false;    318    319          if (dc_stream_check_cursor_attributes(stream, stream-\u003ectx-\u003edc-\u003ecurrent_state, attributes)) {                                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Here. This function used to check for if stream as NULL and return false at the start. Probably we should add that back.","modified":"2026-08-27T22:47:46.117521530Z","published":"2025-11-12T11:15:44.700Z","upstream":["CVE-2025-40148"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-40148"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.17.6-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.2-1~exp1","6.17.5-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-40148.json"}}],"schema_version":"1.9.0"}