{"id":"CVE-2026-46263","revision":"9db40ade05df408d912896b271394238","records":[{"revision":"9db40ade05df408d912896b271394238","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-46263","aliases":[],"title":"drm/amd/display: Fix out-of-bounds stream encoder index v3","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Fix out-of-bounds stream encoder index v3\n\neng_id can be negative and that stream_enc_regs[]\ncan be indexed out of bounds.\n\neng_id is used directly as an index into stream_enc_regs[], which has\nonly 5 entries. When eng_id is 5 (ENGINE_ID_DIGF) or negative, this can\naccess memory past the end of the array.\n\nAdd a bounds check using ARRAY_SIZE() before using eng_id as an index.\nThe unsigned cast also rejects negative values.\n\nThis avoids out-of-bounds access.\n\nFixes the below smatch error:\ndcn*_resource.c: stream_encoder_create() may index\nstream_enc_regs[eng_id] out of bounds (size 5).\n\ndrivers/gpu/drm/amd/amdgpu/../display/dc/resource/dcn351/dcn351_resource.c\n    1246 static struct stream_encoder *dcn35_stream_encoder_create(\n    1247         enum engine_id eng_id,\n    1248         struct dc_context *ctx)\n    1249 {\n\n    ...\n\n    1255\n    1256         /* Mapping of VPG, AFMT, DME register blocks to DIO block instance */\n    1257         if (eng_id <= ENGINE_ID_DIGF) {\n\nENGINE_ID_DIGF is 5.  should <= be <?\n\nUnrelated but, ugh, why is Smatch saying that \"eng_id\" can be negative?\nend_id is type signed long, but there are checks in the caller which prevent it from being negative.\n\n    1258                 vpg_inst = eng_id;\n    1259                 afmt_inst = eng_id;\n    1260         } else\n    1261                 return NULL;\n    1262\n\n    ...\n\n    1281\n    1282         dcn35_dio_stream_encoder_construct(enc1, ctx, ctx->dc_bios,\n    1283                                         eng_id, vpg, afmt,\n--> 1284                                         &stream_enc_regs[eng_id],\n                                                  ^^^^^^^^^^^^^^^^^^^^^^^ This stream_enc_regs[] array has 5 elements so we are one element beyond the end of the array.\n\n    ...\n\n    1287         return &enc1->base;\n    1288 }\n\nv2: use explicit bounds check as suggested by Roman/Dan; avoid unsigned int cast\n\nv3: The compiler already knows how to compare the two values, so the\n    cast (int) is not needed. (Roman)","state":0,"publishedAt":"2026-06-03T15:50:02.572+00:00","modifiedAt":"2026-10-19T19:36:56.301+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/gpu/drm/amd/display/dc/resource/dcn315/dcn315_resource.c\",\n                        \"drivers/gpu/drm/amd/display/dc/resource/dcn316/dcn316_resource.c\",\n                        \"drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c\",\n                        \"drivers/gpu/drm/amd/display/dc/resource/dcn321/dcn321_resource.c\",\n                        \"drivers/gpu/drm/amd/display/dc/resource/dcn35/dcn35_resource.c\",\n                        \"drivers/gpu/drm/amd/display/dc/resource/dcn351/dcn351_resource.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2728e9c7c84235d2d7bc1403174d071ffc82d6d2\",\n                            \"lessThan\": \"29f3824b08a98d41ecbbfd33580630d7607f962e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2728e9c7c84235d2d7bc1403174d071ffc82d6d2\",\n                            \"lessThan\": \"263e28add4f4472cfa95150d218955d1945aa413\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2728e9c7c84235d2d7bc1403174d071ffc82d6d2\",\n                            \"lessThan\": \"ca3808d560ad946ab6d089fd1f5bee04b952ead4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2728e9c7c84235d2d7bc1403174d071ffc82d6d2\",\n                            \"lessThan\": \"abde491143e4e12eecc41337910aace4e8d59603\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/gpu/drm/amd/display/dc/resource/dcn315/dcn315_resource.c\",\n                        \"drivers/gpu/drm/amd/display/dc/resource/dcn316/dcn316_resource.c\",\n                        \"drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c\",\n                        \"drivers/gpu/drm/amd/display/dc/resource/dcn321/dcn321_resource.c\",\n                        \"drivers/gpu/drm/amd/display/dc/resource/dcn35/dcn35_resource.c\",\n                        \"drivers/gpu/drm/amd/display/dc/resource/dcn351/dcn351_resource.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.9\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.9\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.75\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.14\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.4\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/29f3824b08a98d41ecbbfd33580630d7607f962e","https://git.kernel.org/stable/c/263e28add4f4472cfa95150d218955d1945aa413","https://git.kernel.org/stable/c/ca3808d560ad946ab6d089fd1f5bee04b952ead4","https://git.kernel.org/stable/c/abde491143e4e12eecc41337910aace4e8d59603"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-46263","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-46263","identifiers":["CVE-2026-46263"]},"retained":false,"historicalAffected":[]}],"coverage":[]}