{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1a793caf6f6991716cb07583ed7c27de84ef0cba"
            },
            {
              "fixed": "dc0d79b1be384e7f6a2308356afd10dcf3bf940f"
            },
            {
              "fixed": "86c1617b7d4b001b20a71deda3c791538a4fa6aa"
            },
            {
              "fixed": "9b23a010a1e8232974617c412cb9f578f3378b70"
            },
            {
              "fixed": "0cd8450c257faa0cece0e0c43d3b55d1a389acc7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.9.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90178.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (coretemp) Fix core_data leak on CPUs without PTS\n\npdata-\u003ecore_data is allocated in init_temp_data() when the first core\ntemp_data of a package is created, but it is only released from\ndestroy_temp_data(), and only in the branch that handles the package\ntemp_data.\n\nPackage temp_data is created solely when the CPU supports\nX86_FEATURE_PTS. On a CPU without it, coretemp_cpu_online() never calls\ncoretemp_add_core() with pkg_flag set, so pdata-\u003epkg_data stays NULL.\ncoretemp_cpu_offline() then skips the removal of the package interface,\ndestroy_temp_data() is never called for package data, and the array is\nstill allocated when coretemp_device_remove() frees the platform data\nthat pointed at it.\n\nRelease the array in coretemp_device_remove(). destroy_temp_data() sets\npdata-\u003ecore_data to NULL when it frees it, so the added kfree() is a\nno-op on CPUs that do have PTS.\n\nTested on an Intel Core i5-1135G7. The driver was instrumented to log\nevery allocation and release of pdata-\u003ecore_data, and the PTS check in\ncoretemp_cpu_online() was patched out to emulate a CPU without package\nthermal support. Without this change the array was allocated and never\nreleased, and coretemp_device_remove() still saw a non-NULL pointer.\nWith it the array is released and the pointer accounting balances. On an\nunmodified build the release still happens via the package temp_data and\nthe added kfree() sees NULL, with no slab warnings over repeated module\nload and unload cycles.",
  "id": "CVE-2026-90178",
  "modified": "2026-09-19T03:30:16.448844402Z",
  "published": "2026-09-17T16:07:03.759Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0cd8450c257faa0cece0e0c43d3b55d1a389acc7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/86c1617b7d4b001b20a71deda3c791538a4fa6aa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b23a010a1e8232974617c412cb9f578f3378b70"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dc0d79b1be384e7f6a2308356afd10dcf3bf940f"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90178.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90178"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "hwmon: (coretemp) Fix core_data leak on CPUs without PTS"
}