{"id":"CVE-2026-97446","state":"PUBLISHED","title":"ACPICA: Fix NULL pointer dereference in acpi_ns_custom_package()","description":"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)->Common.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.","publishedAt":"2026-09-24T16:04:01.612Z","updatedAt":"2026-10-03T10:58:30.858Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7952d40240855932de01bbe81c02bf1416ec91d8","status":"affected","lessThan":"fad537538cdfcdc51e41db61bbf9ebe5ed9427eb","versionType":"git"},{"version":"7952d40240855932de01bbe81c02bf1416ec91d8","status":"affected","lessThan":"9936507ac0f2379787a2a805b11ab1cf0f241372","versionType":"git"},{"version":"7952d40240855932de01bbe81c02bf1416ec91d8","status":"affected","lessThan":"644888605f55395e6012ed43e3ed643ef7ab5013","versionType":"git"},{"version":"7952d40240855932de01bbe81c02bf1416ec91d8","status":"affected","lessThan":"08c5dee5da1d8d99b5a4e94db5a3d873c491771e","versionType":"git"},{"version":"7952d40240855932de01bbe81c02bf1416ec91d8","status":"affected","lessThan":"3762c6c8ae5073892d7cec736cc54270c7c9ce90","versionType":"git"},{"version":"7952d40240855932de01bbe81c02bf1416ec91d8","status":"affected","lessThan":"3cbf096a478f4fa03953f0685ad28c9c82ce67cb","versionType":"git"},{"version":"7952d40240855932de01bbe81c02bf1416ec91d8","status":"affected","lessThan":"f8d14b7bb0063bbbd86c0e4d73edb8cea7b362bc","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/acpi/acpica/nsprepkg.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/acpi/acpica/nsprepkg.c"]}],"references":["https://git.kernel.org/stable/c/fad537538cdfcdc51e41db61bbf9ebe5ed9427eb","https://git.kernel.org/stable/c/9936507ac0f2379787a2a805b11ab1cf0f241372","https://git.kernel.org/stable/c/644888605f55395e6012ed43e3ed643ef7ab5013","https://git.kernel.org/stable/c/08c5dee5da1d8d99b5a4e94db5a3d873c491771e","https://git.kernel.org/stable/c/3762c6c8ae5073892d7cec736cc54270c7c9ce90","https://git.kernel.org/stable/c/3cbf096a478f4fa03953f0685ad28c9c82ce67cb","https://git.kernel.org/stable/c/f8d14b7bb0063bbbd86c0e4d73edb8cea7b362bc"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/97xxx/CVE-2026-97446.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-97446","state":"PUBLISHED","datePublished":"2026-09-24T16:04:01.612Z","dateUpdated":"2026-10-03T10:58:30.858Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-24T14:53:16.870Z"},"containers":{"cna":{"title":"ACPICA: Fix NULL pointer dereference in acpi_ns_custom_package()","descriptions":[{"lang":"en","value":"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)->Common.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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7952d40240855932de01bbe81c02bf1416ec91d8","status":"affected","lessThan":"fad537538cdfcdc51e41db61bbf9ebe5ed9427eb","versionType":"git"},{"version":"7952d40240855932de01bbe81c02bf1416ec91d8","status":"affected","lessThan":"9936507ac0f2379787a2a805b11ab1cf0f241372","versionType":"git"},{"version":"7952d40240855932de01bbe81c02bf1416ec91d8","status":"affected","lessThan":"644888605f55395e6012ed43e3ed643ef7ab5013","versionType":"git"},{"version":"7952d40240855932de01bbe81c02bf1416ec91d8","status":"affected","lessThan":"08c5dee5da1d8d99b5a4e94db5a3d873c491771e","versionType":"git"},{"version":"7952d40240855932de01bbe81c02bf1416ec91d8","status":"affected","lessThan":"3762c6c8ae5073892d7cec736cc54270c7c9ce90","versionType":"git"},{"version":"7952d40240855932de01bbe81c02bf1416ec91d8","status":"affected","lessThan":"3cbf096a478f4fa03953f0685ad28c9c82ce67cb","versionType":"git"},{"version":"7952d40240855932de01bbe81c02bf1416ec91d8","status":"affected","lessThan":"f8d14b7bb0063bbbd86c0e4d73edb8cea7b362bc","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/acpi/acpica/nsprepkg.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/acpi/acpica/nsprepkg.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/fad537538cdfcdc51e41db61bbf9ebe5ed9427eb"},{"url":"https://git.kernel.org/stable/c/9936507ac0f2379787a2a805b11ab1cf0f241372"},{"url":"https://git.kernel.org/stable/c/644888605f55395e6012ed43e3ed643ef7ab5013"},{"url":"https://git.kernel.org/stable/c/08c5dee5da1d8d99b5a4e94db5a3d873c491771e"},{"url":"https://git.kernel.org/stable/c/3762c6c8ae5073892d7cec736cc54270c7c9ce90"},{"url":"https://git.kernel.org/stable/c/3cbf096a478f4fa03953f0685ad28c9c82ce67cb"},{"url":"https://git.kernel.org/stable/c/f8d14b7bb0063bbbd86c0e4d73edb8cea7b362bc"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-03T10:58:30.858Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}