{"id":"CVE-2026-64219","summary":"drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async","details":"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-\u003elength 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 \u003e 16 this\nresults in a stack buffer overflow via memcpy.\n\nAdditionally, link_index is used to dereference dc-\u003elinks[] without\nbounds checking against dc-\u003elink_count, risking an out-of-bounds access.\n\nReplace the ASSERT with a hard runtime check that returns false when\npayload-\u003elength exceeds the destination buffer size, and add a bounds\ncheck for link_index before it is used.\n\n(cherry picked from commit ba4caa9fecdf7a38f98c878ad05a8a64148b6881)","modified":"2026-07-28T03:46:32.306150265Z","published":"2026-07-24T15:23:06.379Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64219.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/16a5fa57565afb6bf37e18129921c270c93d8e2b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1c8c6e912f2945b2a3e669afca6b52174b88e86e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1ecde19bfce6535bffddad1139ff466b6d401b8e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3265f3ed373fb8048be713aadcdf702579a0e53d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6c92f6d9600efa3ef0d9e560a2b52776d9803c29"},{"type":"WEB","url":"https://git.kernel.org/stable/c/90c398e822ca76e40548df0c061dd4f93ea92d71"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d6590e3f766e3111dd1beaf88b9384d117acfa6b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64219.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64219"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4f8e37dbaf584de6d38f58b3000b0bfd7eaf2ff6"},{"fixed":"d6590e3f766e3111dd1beaf88b9384d117acfa6b"},{"fixed":"16a5fa57565afb6bf37e18129921c270c93d8e2b"},{"fixed":"90c398e822ca76e40548df0c061dd4f93ea92d71"},{"fixed":"3265f3ed373fb8048be713aadcdf702579a0e53d"},{"fixed":"1ecde19bfce6535bffddad1139ff466b6d401b8e"},{"fixed":"1c8c6e912f2945b2a3e669afca6b52174b88e86e"},{"fixed":"6c92f6d9600efa3ef0d9e560a2b52776d9803c29"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-64219.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.13.0"},{"fixed":"5.15.209"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.175"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.142"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.92"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.34"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-64219.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}