GHSA-76MX-GXXJ-5F36

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-22 18:30
VLAI
Details

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

Input: evdev - sanitize event type index when fetching event masks

The user-supplied event type index passed to EVIOCGMASK / EVIOCSMASK ioctls is used to index the static counts array in evdev_get_mask_cnt() and client evmasks array in evdev_get_mask().

While the event type is architecturally bounded by EV_CNT, speculative execution may mispredict bounds checks and perform out-of-bounds loads.

Sanitize the event type index in evdev_get_mask_cnt() branchlessly using array_index_mask_nospec(). This clamps the index to 0 for safe array access and forces the returned count to 0 speculatively when the index is out of bounds.

We do not need additional array_index_nospec() calls in evdev_get_mask() because evdev_get_mask_cnt() speculatively forces the count (and resulting xfer_size) to 0 for out-of-bounds types, preventing any speculative memory access to client evmasks array.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74683"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:42Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: evdev - sanitize event type index when fetching event masks\n\nThe user-supplied event type index passed to EVIOCGMASK / EVIOCSMASK\nioctls is used to index the static counts array in evdev_get_mask_cnt()\nand client evmasks array in evdev_get_mask().\n\nWhile the event type is architecturally bounded by EV_CNT, speculative\nexecution may mispredict bounds checks and perform out-of-bounds loads.\n\nSanitize the event type index in evdev_get_mask_cnt() branchlessly using\narray_index_mask_nospec(). This clamps the index to 0 for safe array\naccess and forces the returned count to 0 speculatively when the index\nis out of bounds.\n\nWe do not need additional array_index_nospec() calls in evdev_get_mask()\nbecause evdev_get_mask_cnt() speculatively forces the count (and\nresulting xfer_size) to 0 for out-of-bounds types, preventing any\nspeculative memory access to client evmasks array.",
  "id": "GHSA-76mx-gxxj-5f36",
  "modified": "2026-08-22T18:30:29Z",
  "published": "2026-08-22T18:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74683"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3abd29c61d2ef37c4102cf755b18be53bb9dbea6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4034ef247a9dde3f56660b01f0c3280dac6b1274"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/433913b4a92214d76e9f0c03ad9128fec943d5f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5db341189bb7ff041d570dbe36ecca7e32913927"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/810e1883d4815f29c30d900ad7333d03cc2515d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c79b08d8fa230871a3634e34a66e591ac2d084ef"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f27fa9b39f925d26e034a1f382cb45523138f4ae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f3fc329acad9a71b3c077237cbac20670d2358c8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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