{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-97455", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-24T14:53:16.871Z", "datePublished": "2026-09-24T16:04:11.922Z", "dateUpdated": "2026-10-03T10:58:39.822Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-03T10:58:39.822Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPICA: Fix use-after-free in acpi_ds_terminate_control_method()\n\nFix use-after-free issue in acpi_ds_terminate_control_method() by\nclearing references to method locals and arguments." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The data that becomes walk_state->return_desc is AML RefOf(Local/Arg) in the platform DSDT/SSDT. acpi_ex_get_object_reference builds that ACPI_REFCLASS_REFOF; acpi_ps_parse_aml then calls the patched acpi_ds_terminate_control_method from acpi_ns_execute_table (acpi_load_tables) or acpi_ps_execute_method (acpi_evaluate_object). Those tables are local firmware, not a network protocol message.\nAC:L - The table author emits Return(RefOf(LocalN)) or Return(RefOf(ArgN)); acpi_ex_get_object_reference sets reference.object to &walk_state->local_variables[i] or &walk_state->arguments[i]. acpi_ds_terminate_control_method then acpi_ds_method_data_delete_all, acpi_ps_parse_aml still forwards return_desc, and acpi_ds_delete_walk_state frees the node. That sequence is deterministic with no race.\nPR:N - acpi_bus_init calls acpi_load_tables → acpi_tb_load_namespace → acpi_ns_load_table → acpi_ns_execute_table with no uid or capability check. Module-level AML that invokes a nested method returning RefOf(Local/Arg), with the caller Store/DerefOf using that value, hits acpi_ds_terminate_control_method at boot before any account exists.\nUI:N - acpi_ns_execute_table runs that nested Return(RefOf(Local/Arg)) automatically during acpi_load_tables in acpi_bus_init at power-on; the victim does not mount media, open a file, or otherwise interact.\nS:U - The dangling ACPI_REFCLASS_REFOF points at the embedded local_variables[]/arguments[] acpi_namespace_node inside the kmalloc'd acpi_walk_state freed by acpi_ds_delete_walk_state; that is host ACPICA heap corruption, not a KVM/Xen, IOMMU, or sandbox crossing.\nC:H - After acpi_ds_delete_walk_state, acpi_ns_resolve_references reads node->object from the freed local/arg pseudo-node, and a parent DerefOf uses operand[0]->reference.object the same way; that use-after-free of the walk_state slab is an arbitrary kernel-memory read, not a few-byte leak.\nI:H - A parent Store to the returned RefOf calls acpi_ex_store_object_to_node on the dangling node, and acpi_ns_resolve_references does acpi_ut_add_reference on node->object taken from freed walk_state memory; spraying that slab yields a write/refcount primitive and control-flow hijack.\nA:H - acpi_ds_delete_walk_state frees the walk_state while return_desc still aliases its local_variables[]/arguments[] nodes; later ns_resolve_references or DerefOf/Store through that pointer oopses or panics, and any use-after-free is Availability High." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/acpi/acpica/dsmethod.c" ], "versions": [ { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "460aed7b408508a2c28ca4fdd8d90a82bb4005aa", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "3855d8992f5a88b033925cc4f6aef7a485f326cb", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "2793b1c38f0053fd9b119ce4607dd056eb05d382", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "63ca6f67816a229e07a08cac4bef1b3858abde66", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "fe7b3d3b7490c2c0119f2d84fa33996dcbc71042", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "ef5a8d939c1e5b36e75450bbb5b6348faff4dcf3", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "945e87267cfd90937b3c637f87324cbb56998b72", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/acpi/acpica/dsmethod.c" ], "versions": [ { "version": "2.6.12", "status": "affected" }, { "version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.271", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.10.271" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.15.222" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.1.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.12.111" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.18.53" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/460aed7b408508a2c28ca4fdd8d90a82bb4005aa" }, { "url": "https://git.kernel.org/stable/c/3855d8992f5a88b033925cc4f6aef7a485f326cb" }, { "url": "https://git.kernel.org/stable/c/2793b1c38f0053fd9b119ce4607dd056eb05d382" }, { "url": "https://git.kernel.org/stable/c/63ca6f67816a229e07a08cac4bef1b3858abde66" }, { "url": "https://git.kernel.org/stable/c/fe7b3d3b7490c2c0119f2d84fa33996dcbc71042" }, { "url": "https://git.kernel.org/stable/c/ef5a8d939c1e5b36e75450bbb5b6348faff4dcf3" }, { "url": "https://git.kernel.org/stable/c/945e87267cfd90937b3c637f87324cbb56998b72" } ], "title": "ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()", "x_generator": { "engine": "bippy-1.2.0" } } } }