{"id":"CVE-2026-43337","title":"drm/amd/display: Fix NULL pointer dereference in dcn401_init_hw()","summary":"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. Howeve…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= ca0fb243c3bb53dbbd71d16c76f319bf923ee3d4 < fcc51c81cb472eb460310c477460356dc4845ff7","Linux >= ca0fb243c3bb53dbbd71d16c76f319bf923ee3d4 < 10c13c111d0d7f8e101c742feff264fc98e3f9f7","Linux >= ca0fb243c3bb53dbbd71d16c76f319bf923ee3d4 < 2d4a6f0702c5211e0be8b688c5fc24f082ec74d6","Linux >= ca0fb243c3bb53dbbd71d16c76f319bf923ee3d4 < e927b36ae18b66b49219eaa9f46edc7b4fdbb25e","Linux e13689793b9c0e7b5749954e77f5f85e68fe7138","Linux >= 6.11.3 < 6.12","Linux 6.12"],"published":"2026-05-08","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:40:39.405Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43337","references":[{"url":"https://git.kernel.org/stable/c/fcc51c81cb472eb460310c477460356dc4845ff7"},{"url":"https://git.kernel.org/stable/c/10c13c111d0d7f8e101c742feff264fc98e3f9f7"},{"url":"https://git.kernel.org/stable/c/2d4a6f0702c5211e0be8b688c5fc24f082ec74d6"},{"url":"https://git.kernel.org/stable/c/e927b36ae18b66b49219eaa9f46edc7b4fdbb25e"}],"tags":["cve.org"],"epss":0.0016,"epssPercentile":0.04772,"ingestedAt":"2026-10-21T12:48:53.639Z","slug":"CVE-2026-43337","body":"## Overview\n\nIn 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 && 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->clk_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 'dc->res_pool->funcs->update_bw_bounding_box' could be null (see line 362)\n\n(cherry picked from commit 86117c5ab42f21562fedb0a64bffea3ee5fcd477)\n\n## Affected\n\n- `Linux >= ca0fb243c3bb53dbbd71d16c76f319bf923ee3d4 < fcc51c81cb472eb460310c477460356dc4845ff7`\n- `Linux >= ca0fb243c3bb53dbbd71d16c76f319bf923ee3d4 < 10c13c111d0d7f8e101c742feff264fc98e3f9f7`\n- `Linux >= ca0fb243c3bb53dbbd71d16c76f319bf923ee3d4 < 2d4a6f0702c5211e0be8b688c5fc24f082ec74d6`\n- `Linux >= ca0fb243c3bb53dbbd71d16c76f319bf923ee3d4 < e927b36ae18b66b49219eaa9f46edc7b4fdbb25e`\n- `Linux e13689793b9c0e7b5749954e77f5f85e68fe7138`\n- `Linux >= 6.11.3 < 6.12`\n- `Linux 6.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}