{"id":"CVE-2026-97446","summary":"ACPICA: Fix NULL pointer dereference in acpi_ns_custom_package()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nACPICA: Fix NULL pointer dereference in acpi_ns_custom_package()\n\nacpi_ns_custom_package() unconditionally dereferences the first element\nof the package to read the _BIX version number, without checking for\nNULL:\n\n    if ((*Elements)-\u003eCommon.Type != ACPI_TYPE_INTEGER)\n\nWhen firmware returns a _BIX package whose first element is an\nunresolvable reference, ACPICA evaluates that entry to NULL.\nacpi_ns_remove_null_elements() does not strip NULL entries for\nACPI_PTYPE_CUSTOM packages (fixed-position format would break if\nelements were shifted), so acpi_ns_custom_package() sees the NULL\nand causes a crash.\n\nAdd a NULL check for the first element (version field) before\ndereferencing it. The caller then receives AE_AML_OPERAND_TYPE\ninstead of crashing.","modified":"2026-10-22T10:34:07.482448742Z","published":"2026-09-24T16:04:01.612Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97446.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/08c5dee5da1d8d99b5a4e94db5a3d873c491771e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3762c6c8ae5073892d7cec736cc54270c7c9ce90"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3cbf096a478f4fa03953f0685ad28c9c82ce67cb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/644888605f55395e6012ed43e3ed643ef7ab5013"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9936507ac0f2379787a2a805b11ab1cf0f241372"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f8d14b7bb0063bbbd86c0e4d73edb8cea7b362bc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fad537538cdfcdc51e41db61bbf9ebe5ed9427eb"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97446.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97446"},{"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":"7952d40240855932de01bbe81c02bf1416ec91d8"},{"fixed":"fad537538cdfcdc51e41db61bbf9ebe5ed9427eb"},{"fixed":"9936507ac0f2379787a2a805b11ab1cf0f241372"},{"fixed":"644888605f55395e6012ed43e3ed643ef7ab5013"},{"fixed":"08c5dee5da1d8d99b5a4e94db5a3d873c491771e"},{"fixed":"3762c6c8ae5073892d7cec736cc54270c7c9ce90"},{"fixed":"3cbf096a478f4fa03953f0685ad28c9c82ce67cb"},{"fixed":"f8d14b7bb0063bbbd86c0e4d73edb8cea7b362bc"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-97446.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.7.0"},{"fixed":"5.10.271"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.222"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.189"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.158"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.111"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.53"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-97446.json"}}],"schema_version":"1.9.2"}