CVE-2026-43337 (GCVE-0-2026-43337)
Vulnerability from cvelistv5
Published
2026-05-08 13:31
Modified
2026-05-23 16:06
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix NULL pointer dereference in dcn401_init_hw() dcn401_init_hw() assumes that update_bw_bounding_box() is valid when entering the update path. However, the existing condition: ((!fams2_enable && update_bw_bounding_box) || freq_changed) does not guarantee this, as the freq_changed branch can evaluate to true independently of the callback pointer. This can result in calling update_bw_bounding_box() when it is NULL. Fix this by separating the update condition from the pointer checks and ensuring the callback, dc->clk_mgr, and bw_params are validated before use. Fixes the below: ../dc/hwss/dcn401/dcn401_hwseq.c:367 dcn401_init_hw() error: we previously assumed 'dc->res_pool->funcs->update_bw_bounding_box' could be null (see line 362) (cherry picked from commit 86117c5ab42f21562fedb0a64bffea3ee5fcd477)
References
Impacted products
Vendor Product Version
Linux Linux Version: ca0fb243c3bb53dbbd71d16c76f319bf923ee3d4
Version: ca0fb243c3bb53dbbd71d16c76f319bf923ee3d4
Version: ca0fb243c3bb53dbbd71d16c76f319bf923ee3d4
Version: e13689793b9c0e7b5749954e77f5f85e68fe7138
Version: 6.11.3   ≤
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c"
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Fix NULL pointer dereference in dcn401_init_hw()\n\ndcn401_init_hw() assumes that update_bw_bounding_box() is valid when\nentering the update path. However, the existing condition:\n\n  ((!fams2_enable \u0026\u0026 update_bw_bounding_box) || freq_changed)\n\ndoes not guarantee this, as the freq_changed branch can evaluate to true\nindependently of the callback pointer.\n\nThis can result in calling update_bw_bounding_box() when it is NULL.\n\nFix this by separating the update condition from the pointer checks and\nensuring the callback, dc-\u003eclk_mgr, and bw_params are validated before\nuse.\n\nFixes the below:\n../dc/hwss/dcn401/dcn401_hwseq.c:367 dcn401_init_hw() error: we previously assumed \u0027dc-\u003eres_pool-\u003efuncs-\u003eupdate_bw_bounding_box\u0027 could be null (see line 362)\n\n(cherry picked from commit 86117c5ab42f21562fedb0a64bffea3ee5fcd477)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-23T16:06:47.060Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/10c13c111d0d7f8e101c742feff264fc98e3f9f7"
        },
        {
          "url": "https://git.kernel.org/stable/c/2d4a6f0702c5211e0be8b688c5fc24f082ec74d6"
        },
        {
          "url": "https://git.kernel.org/stable/c/e927b36ae18b66b49219eaa9f46edc7b4fdbb25e"
        }
      ],
      "title": "drm/amd/display: Fix NULL pointer dereference in dcn401_init_hw()",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43337",
    "datePublished": "2026-05-08T13:31:22.967Z",
    "dateReserved": "2026-05-01T14:12:56.002Z",
    "dateUpdated": "2026-05-23T16:06:47.060Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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