{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "ea009e4769fa3bd05d4c111c3b6865eb3a9be829"
            },
            {
              "fixed": "beb22ebf76c0415f22d2d0c3f1ff0627e7ae4a68"
            },
            {
              "fixed": "1a8bab5ceee1a42a78de12d3d69f67516a20588e"
            },
            {
              "fixed": "1889a9156553f0692acd57caf15e877baace1a01"
            },
            {
              "fixed": "d19385624bdfb577db9c94bb8879992fd5e17bcd"
            },
            {
              "fixed": "80e0d353c86a9a168ad6d213f494796294381538"
            }
          ],
          "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": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "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-2026-89443.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86: ISST: Validate level in perf mask ioctls\n\nisst_if_get_perf_level_mask() and isst_if_get_base_freq_mask() use the\nuser-provided level as an index into perf_levels[] via\n_read_pp_level_info() and _read_bf_level_info(), but neither helper\nvalidates it first.\n\nThe adjacent level-info helpers reject levels above max_level before\nreading the same per-level register block. Add the same bounds checks to\nthe mask helpers, and reject disabled SST-PP levels in\nisst_if_get_perf_level_mask() to match isst_if_get_perf_level_info().\n\nThis prevents out-of-bounds reads from the per-level offset table on\ninvalid ioctl input.",
  "id": "CVE-2026-89443",
  "modified": "2026-09-16T03:30:36.388104349Z",
  "published": "2026-09-11T19:43:11.407Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1889a9156553f0692acd57caf15e877baace1a01"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1a8bab5ceee1a42a78de12d3d69f67516a20588e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/80e0d353c86a9a168ad6d213f494796294381538"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/beb22ebf76c0415f22d2d0c3f1ff0627e7ae4a68"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d19385624bdfb577db9c94bb8879992fd5e17bcd"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89443.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89443"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "platform/x86: ISST: Validate level in perf mask ioctls"
}