CVE-2025-40148 (GCVE-0-2025-40148)

Vulnerability from cvelistv5 – Published: 2025-11-12 10:23 – Updated: 2026-05-11 21:43
VLAI
Title
drm/amd/display: Add NULL pointer checks in dc_stream cursor attribute functions
Summary
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->ctx->dc->current_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->ctx->dc : NULL; ^^^^^^ The old code assumed stream could be NULL. 335 --> 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->ctx->dc->current_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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4465dd0e41e8223a46a41ce4fcdfc55fabd319d8 , < 01e793e7d4d402c473f1a61ca5824f086693be65 (git)
Affected: 4465dd0e41e8223a46a41ce4fcdfc55fabd319d8 , < bf4e4b97d0fdc66f04fc19d807e24dd8421b8f11 (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.17.3 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/core/dc_stream.c"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Add NULL pointer checks in dc_stream cursor attribute functions\n\nThe function dc_stream_set_cursor_attributes() currently dereferences\nthe `stream` pointer and nested members `stream-\u003ectx-\u003edc-\u003ecurrent_state`\nwithout checking for NULL.\n\nAll callers of these functions, such as in\n`dcn30_apply_idle_power_optimizations()` and\n`amdgpu_dm_plane_handle_cursor_update()`, already perform NULL checks\nbefore calling these functions.\n\nFixes below:\ndrivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:336 dc_stream_program_cursor_attributes()\nerror: we previously assumed \u0027stream\u0027 could be null (see line 334)\n\ndrivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c\n    327 bool dc_stream_program_cursor_attributes(\n    328         struct dc_stream_state *stream,\n    329         const struct dc_cursor_attributes *attributes)\n    330 {\n    331         struct dc  *dc;\n    332         bool reset_idle_optimizations = false;\n    333\n    334         dc = stream ? stream-\u003ectx-\u003edc : NULL;\n                     ^^^^^^\nThe old code assumed stream could be NULL.\n\n    335\n--\u003e 336         if (dc_stream_set_cursor_attributes(stream, attributes)) {\n                                                    ^^^^^^\nThe refactor added an unchecked dereference.\n\ndrivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c\n   313  bool dc_stream_set_cursor_attributes(\n   314          struct dc_stream_state *stream,\n   315          const struct dc_cursor_attributes *attributes)\n   316  {\n   317          bool result = false;\n   318\n   319          if (dc_stream_check_cursor_attributes(stream, stream-\u003ectx-\u003edc-\u003ecurrent_state, attributes)) {\n                                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Here.\nThis function used to check for if stream as NULL and return false at\nthe start. Probably we should add that back."
        }
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        "dateUpdated": "2026-05-11T21:43:39.984Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/01e793e7d4d402c473f1a61ca5824f086693be65"
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          "url": "https://git.kernel.org/stable/c/bf4e4b97d0fdc66f04fc19d807e24dd8421b8f11"
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      "title": "drm/amd/display: Add NULL pointer checks in dc_stream cursor attribute functions",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40148",
    "datePublished": "2025-11-12T10:23:26.841Z",
    "dateReserved": "2025-04-16T07:20:57.175Z",
    "dateUpdated": "2026-05-11T21:43:39.984Z",
    "state": "PUBLISHED"
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      "date": "2026-05-28",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40148\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-11-12T11:15:44.700\",\"lastModified\":\"2025-11-12T16:19:12.850\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm/amd/display: Add NULL pointer checks in dc_stream cursor attribute functions\\n\\nThe function dc_stream_set_cursor_attributes() currently dereferences\\nthe `stream` pointer and nested members `stream-\u003ectx-\u003edc-\u003ecurrent_state`\\nwithout checking for NULL.\\n\\nAll callers of these functions, such as in\\n`dcn30_apply_idle_power_optimizations()` and\\n`amdgpu_dm_plane_handle_cursor_update()`, already perform NULL checks\\nbefore calling these functions.\\n\\nFixes below:\\ndrivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:336 dc_stream_program_cursor_attributes()\\nerror: we previously assumed \u0027stream\u0027 could be null (see line 334)\\n\\ndrivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c\\n    327 bool dc_stream_program_cursor_attributes(\\n    328         struct dc_stream_state *stream,\\n    329         const struct dc_cursor_attributes *attributes)\\n    330 {\\n    331         struct dc  *dc;\\n    332         bool reset_idle_optimizations = false;\\n    333\\n    334         dc = stream ? stream-\u003ectx-\u003edc : NULL;\\n                     ^^^^^^\\nThe old code assumed stream could be NULL.\\n\\n    335\\n--\u003e 336         if (dc_stream_set_cursor_attributes(stream, attributes)) {\\n                                                    ^^^^^^\\nThe refactor added an unchecked dereference.\\n\\ndrivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c\\n   313  bool dc_stream_set_cursor_attributes(\\n   314          struct dc_stream_state *stream,\\n   315          const struct dc_cursor_attributes *attributes)\\n   316  {\\n   317          bool result = false;\\n   318\\n   319          if (dc_stream_check_cursor_attributes(stream, stream-\u003ectx-\u003edc-\u003ecurrent_state, attributes)) {\\n                                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Here.\\nThis function used to check for if stream as NULL and return false at\\nthe start. Probably we should add that back.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/01e793e7d4d402c473f1a61ca5824f086693be65\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bf4e4b97d0fdc66f04fc19d807e24dd8421b8f11\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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