{"id":"CVE-2026-97448","state":"PUBLISHED","title":"ACPICA: Add validation for node in acpi_ns_build_normalized_path()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nACPICA: Add validation for node in acpi_ns_build_normalized_path()\n\nAdd validation for node in acpi_ns_build_normalized_path()\nto prevent use-after-free vulnerabilities.","publishedAt":"2026-09-24T16:04:03.667Z","updatedAt":"2026-10-03T10:58:31.976Z","severity":{"score":7.7,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d1e7ffe50ba588ddf7de520990815c37f31776d8","status":"affected","lessThan":"087eed8b347e14864f8806fa1f5976c7dc2c6792","versionType":"git"},{"version":"d1e7ffe50ba588ddf7de520990815c37f31776d8","status":"affected","lessThan":"b06bb9b82c8f9a522dde213b1e0ddd535f22e3a2","versionType":"git"},{"version":"d1e7ffe50ba588ddf7de520990815c37f31776d8","status":"affected","lessThan":"90ebe7f8bb6ca1c6eadb16bed141ab8bb3dbab70","versionType":"git"},{"version":"d1e7ffe50ba588ddf7de520990815c37f31776d8","status":"affected","lessThan":"26dd27000e9540fcb594f15010b0696b03b0d240","versionType":"git"},{"version":"d1e7ffe50ba588ddf7de520990815c37f31776d8","status":"affected","lessThan":"babb146ceb79e71f328788f1e2c8c7c224026e61","versionType":"git"},{"version":"d1e7ffe50ba588ddf7de520990815c37f31776d8","status":"affected","lessThan":"21a73528579fcbd673b668bd27a05b658123bc1b","versionType":"git"},{"version":"d1e7ffe50ba588ddf7de520990815c37f31776d8","status":"affected","lessThan":"96b2b616870e46e2bc04efec03879683a0036e66","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/acpi/acpica/nsnames.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.3","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/nsnames.c"]}],"references":["https://git.kernel.org/stable/c/087eed8b347e14864f8806fa1f5976c7dc2c6792","https://git.kernel.org/stable/c/b06bb9b82c8f9a522dde213b1e0ddd535f22e3a2","https://git.kernel.org/stable/c/90ebe7f8bb6ca1c6eadb16bed141ab8bb3dbab70","https://git.kernel.org/stable/c/26dd27000e9540fcb594f15010b0696b03b0d240","https://git.kernel.org/stable/c/babb146ceb79e71f328788f1e2c8c7c224026e61","https://git.kernel.org/stable/c/21a73528579fcbd673b668bd27a05b658123bc1b","https://git.kernel.org/stable/c/96b2b616870e46e2bc04efec03879683a0036e66"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/97xxx/CVE-2026-97448.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-97448","state":"PUBLISHED","datePublished":"2026-09-24T16:04:03.667Z","dateUpdated":"2026-10-03T10:58:31.976Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-24T14:53:16.870Z"},"containers":{"cna":{"title":"ACPICA: Add validation for node in acpi_ns_build_normalized_path()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nACPICA: Add validation for node in acpi_ns_build_normalized_path()\n\nAdd validation for node in acpi_ns_build_normalized_path()\nto prevent use-after-free vulnerabilities."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d1e7ffe50ba588ddf7de520990815c37f31776d8","status":"affected","lessThan":"087eed8b347e14864f8806fa1f5976c7dc2c6792","versionType":"git"},{"version":"d1e7ffe50ba588ddf7de520990815c37f31776d8","status":"affected","lessThan":"b06bb9b82c8f9a522dde213b1e0ddd535f22e3a2","versionType":"git"},{"version":"d1e7ffe50ba588ddf7de520990815c37f31776d8","status":"affected","lessThan":"90ebe7f8bb6ca1c6eadb16bed141ab8bb3dbab70","versionType":"git"},{"version":"d1e7ffe50ba588ddf7de520990815c37f31776d8","status":"affected","lessThan":"26dd27000e9540fcb594f15010b0696b03b0d240","versionType":"git"},{"version":"d1e7ffe50ba588ddf7de520990815c37f31776d8","status":"affected","lessThan":"babb146ceb79e71f328788f1e2c8c7c224026e61","versionType":"git"},{"version":"d1e7ffe50ba588ddf7de520990815c37f31776d8","status":"affected","lessThan":"21a73528579fcbd673b668bd27a05b658123bc1b","versionType":"git"},{"version":"d1e7ffe50ba588ddf7de520990815c37f31776d8","status":"affected","lessThan":"96b2b616870e46e2bc04efec03879683a0036e66","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/acpi/acpica/nsnames.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.3","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/nsnames.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/087eed8b347e14864f8806fa1f5976c7dc2c6792"},{"url":"https://git.kernel.org/stable/c/b06bb9b82c8f9a522dde213b1e0ddd535f22e3a2"},{"url":"https://git.kernel.org/stable/c/90ebe7f8bb6ca1c6eadb16bed141ab8bb3dbab70"},{"url":"https://git.kernel.org/stable/c/26dd27000e9540fcb594f15010b0696b03b0d240"},{"url":"https://git.kernel.org/stable/c/babb146ceb79e71f328788f1e2c8c7c224026e61"},{"url":"https://git.kernel.org/stable/c/21a73528579fcbd673b668bd27a05b658123bc1b"},{"url":"https://git.kernel.org/stable/c/96b2b616870e46e2bc04efec03879683a0036e66"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","baseScore":7.7,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The stale node that acpi_ns_build_normalized_path() walks is produced while executing attacker-supplied DSDT/SSDT AML: acpi_bus_init()→acpi_load_tables()→acpi_tb_load_namespace()→acpi_ns_load_table()→acpi_ns_execute_table()→acpi_ps_parse_aml()→acpi_ds_terminate_control_method()→acpi_ex_stop_trace_method()→acpi_ns_get_normalized_pathname(); those table bytes come from platform firmware, not a network protocol.\nAC:L - ACPICA issue #1138 reproduces a deterministic heap-use-after-free: acpi_ps_parse_aml() frees a walk_state via acpi_ds_delete_walk_state(), then acpi_ds_terminate_control_method() calls acpi_ex_stop_trace_method() which always invokes acpi_ns_get_normalized_pathname() on method_desc->method.node; crafted AML (issue33.aml) makes that pointer alias the freed walk_state with no race.\nPR:N - acpi_bus_init() calls acpi_load_tables() at boot with no capable() or credential check, so module-level AML in a compromised DSDT/SSDT reaches acpi_ex_stop_trace_method()→acpi_ns_build_normalized_path() inside acpi_ns_execute_table() before any Linux account exists.\nUI:N - acpi_ns_execute_table() evaluates the DSDT/SSDT as a module-level method during acpi_load_tables() on ordinary power-on; the terminate-path UAF fires without a victim mount, sysfs open, or configfs SSDT write.\nS:U - The use-after-free is ACPI_MOVE_32_TO_32 of next_node->name inside a freed host-kernel acpi_walk_state in acpi_ns_build_normalized_path(); it does not cross a KVM/Xen, IOMMU, or sandbox boundary.\nC:H - acpi_ns_build_normalized_path() reads 4-byte namesegs and follows next_node->parent on the freed 1176-byte walk_state (ASAN: heap-use-after-free READ of size 4 at the ACPI_MOVE_32_TO_32 of next_node->name); after slab reuse that parent walk is an unbounded kernel-heap read, not a few header bytes.\nI:N - The UAF is a read of next_node->name and next_node->parent; ACPI_PATH_PUT8 only writes into the separately allocated pathname buffer from acpi_ns_get_normalized_pathname(), and acpi_ex_stop_trace_method() then ACPI_FREE()s that buffer, so there is no write through the freed walk_state.\nA:H - The reported AddressSanitizer heap-use-after-free in AcpiNsBuildNormalizedPath during AcpiLoadTables/acpi_ns_execute_table oopses the kernel at boot, and a cyclic parent pointer in the reclaimed walk_state can also hang the while (next_node && next_node != acpi_gbl_root_node) loop."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-03T10:58:31.976Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}