GHSA-5HF2-3P4G-QFHR

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

platform/x86: ISST: Validate level in perf mask ioctls

isst_if_get_perf_level_mask() and isst_if_get_base_freq_mask() use the user-provided level as an index into perf_levels[] via _read_pp_level_info() and _read_bf_level_info(), but neither helper validates it first.

The adjacent level-info helpers reject levels above max_level before reading the same per-level register block. Add the same bounds checks to the mask helpers, and reject disabled SST-PP levels in isst_if_get_perf_level_mask() to match isst_if_get_perf_level_info().

This prevents out-of-bounds reads from the per-level offset table on invalid ioctl input.

Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-89443"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:24Z",
    "severity": "HIGH"
  },
  "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": "GHSA-5hf2-3p4g-qfhr",
  "modified": "2026-09-14T15:32:23Z",
  "published": "2026-09-11T21:31:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89443"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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