{"api_version":"1","generated_at":"2026-09-11T22:32:24+00:00","cve":"CVE-2026-89442","urls":{"html":"https://cve.report/CVE-2026-89442","api":"https://cve.report/api/cve/CVE-2026-89442.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89442","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89442"},"summary":{"title":"platform/x86: ISST: Validate socket ID in clos_assoc ioctl","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86: ISST: Validate socket ID in clos_assoc ioctl\n\nisst_if_clos_assoc() validates the user-supplied socket_id with\n'socket_id > topology_max_packages()', but isst_common.sst_inst[] is\nallocated with topology_max_packages() entries, so the valid index range\nis [0, topology_max_packages()).  The '>' comparison lets\nsocket_id == topology_max_packages() pass and index one entry past the\narray.\n\nIn addition, isst_common.sst_inst[socket_id] is NULL for an in-range\npackage that has no bound TPMI SST instance, and the pointer is used\nwithout a NULL check.  Both the out-of-bounds entry and the NULL pointer\nare then dereferenced by map_partition_power_domain_id() and the\nfollowing power_domain_info access.\n\nReject socket_id >= topology_max_packages() and a NULL sst_inst, matching\nthe checks already performed by get_instance().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:19:24","updated_at":"2026-09-11 20:19:24"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/207b4dc6eb100141b122b2602504a1429a4b6558","name":"https://git.kernel.org/stable/c/207b4dc6eb100141b122b2602504a1429a4b6558","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca","name":"https://git.kernel.org/stable/c/82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0d90ab5f80e19cddfeb0c9fab47a1f34aa932075","name":"https://git.kernel.org/stable/c/0d90ab5f80e19cddfeb0c9fab47a1f34aa932075","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a89f07db0cb95c54dac4a8406c79a04e44a73c3c","name":"https://git.kernel.org/stable/c/a89f07db0cb95c54dac4a8406c79a04e44a73c3c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89442","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89442","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 12a7d2cb811dd8a884dea088a2701fcb8d00136e 0d90ab5f80e19cddfeb0c9fab47a1f34aa932075 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 12a7d2cb811dd8a884dea088a2701fcb8d00136e 82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 12a7d2cb811dd8a884dea088a2701fcb8d00136e 207b4dc6eb100141b122b2602504a1429a4b6558 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 12a7d2cb811dd8a884dea088a2701fcb8d00136e a89f07db0cb95c54dac4a8406c79a04e44a73c3c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.4","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.4 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.109 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.50 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.4 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"0d90ab5f80e19cddfeb0c9fab47a1f34aa932075","status":"affected","version":"12a7d2cb811dd8a884dea088a2701fcb8d00136e","versionType":"git"},{"lessThan":"82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca","status":"affected","version":"12a7d2cb811dd8a884dea088a2701fcb8d00136e","versionType":"git"},{"lessThan":"207b4dc6eb100141b122b2602504a1429a4b6558","status":"affected","version":"12a7d2cb811dd8a884dea088a2701fcb8d00136e","versionType":"git"},{"lessThan":"a89f07db0cb95c54dac4a8406c79a04e44a73c3c","status":"affected","version":"12a7d2cb811dd8a884dea088a2701fcb8d00136e","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.4"},{"lessThan":"6.4","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.109","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.50","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.109","versionStartIncluding":"6.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.50","versionStartIncluding":"6.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.4","versionStartIncluding":"6.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"6.4","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86: ISST: Validate socket ID in clos_assoc ioctl\n\nisst_if_clos_assoc() validates the user-supplied socket_id with\n'socket_id > topology_max_packages()', but isst_common.sst_inst[] is\nallocated with topology_max_packages() entries, so the valid index range\nis [0, topology_max_packages()).  The '>' comparison lets\nsocket_id == topology_max_packages() pass and index one entry past the\narray.\n\nIn addition, isst_common.sst_inst[socket_id] is NULL for an in-range\npackage that has no bound TPMI SST instance, and the pointer is used\nwithout a NULL check.  Both the out-of-bounds entry and the NULL pointer\nare then dereferenced by map_partition_power_domain_id() and the\nfollowing power_domain_info access.\n\nReject socket_id >= topology_max_packages() and a NULL sst_inst, matching\nthe checks already performed by get_instance()."}],"providerMetadata":{"dateUpdated":"2026-09-11T19:43:10.753Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/0d90ab5f80e19cddfeb0c9fab47a1f34aa932075"},{"url":"https://git.kernel.org/stable/c/82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca"},{"url":"https://git.kernel.org/stable/c/207b4dc6eb100141b122b2602504a1429a4b6558"},{"url":"https://git.kernel.org/stable/c/a89f07db0cb95c54dac4a8406c79a04e44a73c3c"}],"title":"platform/x86: ISST: Validate socket ID in clos_assoc ioctl","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89442","datePublished":"2026-09-11T19:43:10.753Z","dateReserved":"2026-09-11T19:38:34.703Z","dateUpdated":"2026-09-11T19:43:10.753Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:19:24","lastModifiedDate":"2026-09-11 20:19:24","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89442","Ordinal":"1","Title":"platform/x86: ISST: Validate socket ID in clos_assoc ioctl","CVE":"CVE-2026-89442","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89442","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86: ISST: Validate socket ID in clos_assoc ioctl\n\nisst_if_clos_assoc() validates the user-supplied socket_id with\n'socket_id > topology_max_packages()', but isst_common.sst_inst[] is\nallocated with topology_max_packages() entries, so the valid index range\nis [0, topology_max_packages()).  The '>' comparison lets\nsocket_id == topology_max_packages() pass and index one entry past the\narray.\n\nIn addition, isst_common.sst_inst[socket_id] is NULL for an in-range\npackage that has no bound TPMI SST instance, and the pointer is used\nwithout a NULL check.  Both the out-of-bounds entry and the NULL pointer\nare then dereferenced by map_partition_power_domain_id() and the\nfollowing power_domain_info access.\n\nReject socket_id >= topology_max_packages() and a NULL sst_inst, matching\nthe checks already performed by get_instance().","Type":"Description","Title":"platform/x86: ISST: Validate socket ID in clos_assoc ioctl"}]}}}