{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "12a7d2cb811dd8a884dea088a2701fcb8d00136e"
            },
            {
              "fixed": "0d90ab5f80e19cddfeb0c9fab47a1f34aa932075"
            },
            {
              "fixed": "82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca"
            },
            {
              "fixed": "207b4dc6eb100141b122b2602504a1429a4b6558"
            },
            {
              "fixed": "a89f07db0cb95c54dac4a8406c79a04e44a73c3c"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.4.0"
            },
            {
              "fixed": "6.12.109"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89442.json"
  },
  "details": "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 \u003e 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 '\u003e' 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 \u003e= topology_max_packages() and a NULL sst_inst, matching\nthe checks already performed by get_instance().",
  "id": "CVE-2026-89442",
  "modified": "2026-09-13T03:30:56.960885791Z",
  "published": "2026-09-11T19:43:10.753Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d90ab5f80e19cddfeb0c9fab47a1f34aa932075"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/207b4dc6eb100141b122b2602504a1429a4b6558"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a89f07db0cb95c54dac4a8406c79a04e44a73c3c"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89442.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89442"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "platform/x86: ISST: Validate socket ID in clos_assoc ioctl"
}