{"id":"CVE-2026-98145","summary":"accel/amdxdna: reject a command chain that carries no commands","details":"In the Linux kernel, the following vulnerability has been resolved:\n\naccel/amdxdna: reject a command chain that carries no commands\n\nA chain whose command_count is zero passes the payload length check,\nbecause struct_size(payload, data, 0) is just the header. The fill loop\nthen does not run, so offset stays zero and the request is submitted with\na zero-length buffer.\n\nOn firmware without AIE2_NPU_COMMAND that ends at the opcode check, since\nop is still ERT_INVALID_CMD and aie2_get_chain_msg_op() answers\nMSG_OP_MAX_OPCODE. aie2_get_npu_chain_msg_op() answers\nMSG_OP_CHAIN_EXEC_NPU whatever it is given, so there the submission\ncontinues to drm_clflush_virt_range(cmd_buf, 0), which reads the byte\nbefore the buffer and faults on the vmap guard page. EXEC_CMD is\nreachable by any process that can open the render node.\n\nReject the request instead.","modified":"2026-09-26T03:48:33.227988651Z","published":"2026-09-25T10:36:19.692Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98145.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ed74e8d603df457bfcf16ed4f8f1660a1525759e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ef6d27af71e1dc43181ec797a6aaa77c27c36786"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98145.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98145"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8ed8b02396172b137ca8c78c3cb999ddf4fb0bbf"},{"fixed":"ed74e8d603df457bfcf16ed4f8f1660a1525759e"},{"fixed":"ef6d27af71e1dc43181ec797a6aaa77c27c36786"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98145.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.1.0"},{"fixed":"7.2.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98145.json"}}],"schema_version":"1.9.0"}