{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-97452", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-24T14:53:16.871Z", "datePublished": "2026-09-24T16:04:08.401Z", "dateUpdated": "2026-10-03T10:58:36.364Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-03T10:58:36.364Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPICA: Prevent adding invalid references\n\nPrevent adding references for local, argument, and debug objects\nin acpi_ut_copy_simple_object()." } ], "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 attacker-controlled AML is a CopyObject of a Package whose elements are Local/Arg/Debug references, carried in a DSDT/SSDT rather than a network message. The patched acpi_ut_copy_simple_object() is reached from acpi_ex_opcode_1A_1T_1R(AML_COPY_OBJECT_OP) during acpi_bus_init→acpi_load_tables→acpi_tb_load_namespace→acpi_ns_load_table→acpi_ns_execute_table.\nAC:L - acpi_ds_init_object_from_op() sets a Local/Arg reference.object to &walk_state->local_variables[i]/arguments[i]; after that method returns, acpi_ps_parse_aml() calls acpi_ds_delete_walk_state(). A later module-level CopyObject of the surviving package always UAF-reads that freed node in acpi_ut_add_reference(); the AML author sequences both sides with no race.\nPR:N - acpi_bus_init() calls acpi_load_tables() which runs module-level CopyObject via acpi_ns_execute_table() with no uid or capable() check; a DSDT/SSDT that stores Package(){Local0} from a nested method then CopyObject's it triggers the UAF at boot without a Linux account or configfs SSDT load.\nUI:N - acpi_ns_execute_table() evaluates the table's module-level AML, including the nested method that plants the Local/Arg refs and the subsequent CopyObject, during acpi_load_tables() at ordinary power-on; no mount, file-open, or other victim action is required.\nS:U - The UAF is of the kmalloc'd struct acpi_walk_state (its local_variables/arguments pseudo-nodes) inside the host ACPICA interpreter after acpi_ds_delete_walk_state(); it does not cross a KVM/Xen, IOMMU, or sandbox boundary.\nC:H - acpi_ut_valid_internal_object() reads descriptor_type from the freed walk_state (the reported 1-byte KASAN UAF at the CopyObject copy). Reclaiming that slab as a fake ACPI_DESC_TYPE_OPERAND lets acpi_ut_update_object_reference walk attacker-chosen nested pointers, a UAF read primitive.\nI:H - If the freed walk_state is sprayed as a valid operand, acpi_ut_copy_simple_object()'s acpi_ut_add_reference() calls acpi_ut_update_object_reference(REF_INCREMENT) on attacker-controlled type and nested pointers, a UAF write/refcount-increment primitive; memcpy also plants the dangling pointer into the dest copy.\nA:H - The KASAN report is a heap-use-after-free in acpi_ut_valid_internal_object() on the CopyObject path after acpi_ds_delete_walk_state(); using that dangling Local/Arg node pointer oopses/panics, and any UAF 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/utcopy.c" ], "versions": [ { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "2350a6f89eca45f9219f37b331e4083f96299996", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "61cb905c33d0e0c6ff3c9c90fb269331bce8c2c0", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "d239ccf5069f892cc36b9befafda030b3ca789e6", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "c2cf936b07b0a298637e56e53ef043c7ff8eee31", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e16d1e5fcb17dfc369e20095f8cf5e841101279e", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "a6cd2fc2d5429a5b7d5a8b9ba0e6663e8ccbc9ba", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "6e8c55e13a5e3a9f38921d62924f18ceba3330eb", "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/utcopy.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/2350a6f89eca45f9219f37b331e4083f96299996" }, { "url": "https://git.kernel.org/stable/c/61cb905c33d0e0c6ff3c9c90fb269331bce8c2c0" }, { "url": "https://git.kernel.org/stable/c/d239ccf5069f892cc36b9befafda030b3ca789e6" }, { "url": "https://git.kernel.org/stable/c/c2cf936b07b0a298637e56e53ef043c7ff8eee31" }, { "url": "https://git.kernel.org/stable/c/e16d1e5fcb17dfc369e20095f8cf5e841101279e" }, { "url": "https://git.kernel.org/stable/c/a6cd2fc2d5429a5b7d5a8b9ba0e6663e8ccbc9ba" }, { "url": "https://git.kernel.org/stable/c/6e8c55e13a5e3a9f38921d62924f18ceba3330eb" } ], "title": "ACPICA: Prevent adding invalid references", "x_generator": { "engine": "bippy-1.2.0" } } } }