{"id":"CVE-2026-64219","revision":"485cd658aaea4ded85204314a9cac8b0","records":[{"revision":"485cd658aaea4ded85204314a9cac8b0","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64219","aliases":[],"title":"drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async\n\n[Why&How]\ndc_process_dmub_aux_transfer_async() copies payload->length bytes into a\n16-byte stack buffer (dpaux.data[16]) guarded only by an ASSERT(), which\nis a no-op in release builds. If a caller ever passes length > 16 this\nresults in a stack buffer overflow via memcpy.\n\nAdditionally, link_index is used to dereference dc->links[] without\nbounds checking against dc->link_count, risking an out-of-bounds access.\n\nReplace the ASSERT with a hard runtime check that returns false when\npayload->length exceeds the destination buffer size, and add a bounds\ncheck for link_index before it is used.\n\n(cherry picked from commit ba4caa9fecdf7a38f98c878ad05a8a64148b6881)","state":0,"publishedAt":"2026-07-24T15:23:06.379+00:00","modifiedAt":"2026-10-19T20:28:15.578+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/core/dc.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6\",\n                            \"lessThan\": \"d6590e3f766e3111dd1beaf88b9384d117acfa6b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6\",\n                            \"lessThan\": \"16a5fa57565afb6bf37e18129921c270c93d8e2b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6\",\n                            \"lessThan\": \"90c398e822ca76e40548df0c061dd4f93ea92d71\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6\",\n                            \"lessThan\": \"3265f3ed373fb8048be713aadcdf702579a0e53d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6\",\n                            \"lessThan\": \"1ecde19bfce6535bffddad1139ff466b6d401b8e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6\",\n                            \"lessThan\": \"1c8c6e912f2945b2a3e669afca6b52174b88e86e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6\",\n                            \"lessThan\": \"6c92f6d9600efa3ef0d9e560a2b52776d9803c29\",\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/core/dc.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.209\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.175\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.142\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.92\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.34\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.11\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\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:H/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/d6590e3f766e3111dd1beaf88b9384d117acfa6b","https://git.kernel.org/stable/c/16a5fa57565afb6bf37e18129921c270c93d8e2b","https://git.kernel.org/stable/c/90c398e822ca76e40548df0c061dd4f93ea92d71","https://git.kernel.org/stable/c/3265f3ed373fb8048be713aadcdf702579a0e53d","https://git.kernel.org/stable/c/1ecde19bfce6535bffddad1139ff466b6d401b8e","https://git.kernel.org/stable/c/1c8c6e912f2945b2a3e669afca6b52174b88e86e","https://git.kernel.org/stable/c/6c92f6d9600efa3ef0d9e560a2b52776d9803c29"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64219","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64219","identifiers":["CVE-2026-64219"]},"retained":false,"historicalAffected":[]}],"coverage":[]}