FKIE_CVE-2026-74683

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-08-25 06:18
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3abd29c61d2ef37c4102cf755b18be53bb9dbea6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4034ef247a9dde3f56660b01f0c3280dac6b1274
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/433913b4a92214d76e9f0c03ad9128fec943d5f8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5db341189bb7ff041d570dbe36ecca7e32913927
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/810e1883d4815f29c30d900ad7333d03cc2515d1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c79b08d8fa230871a3634e34a66e591ac2d084ef
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f27fa9b39f925d26e034a1f382cb45523138f4ae
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f3fc329acad9a71b3c077237cbac20670d2358c8
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/input/evdev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c79b08d8fa230871a3634e34a66e591ac2d084ef",
              "status": "affected",
              "version": "06a16293f71927f756dcf37558a79c0b05a91641",
              "versionType": "git"
            },
            {
              "lessThan": "f27fa9b39f925d26e034a1f382cb45523138f4ae",
              "status": "affected",
              "version": "06a16293f71927f756dcf37558a79c0b05a91641",
              "versionType": "git"
            },
            {
              "lessThan": "f3fc329acad9a71b3c077237cbac20670d2358c8",
              "status": "affected",
              "version": "06a16293f71927f756dcf37558a79c0b05a91641",
              "versionType": "git"
            },
            {
              "lessThan": "5db341189bb7ff041d570dbe36ecca7e32913927",
              "status": "affected",
              "version": "06a16293f71927f756dcf37558a79c0b05a91641",
              "versionType": "git"
            },
            {
              "lessThan": "433913b4a92214d76e9f0c03ad9128fec943d5f8",
              "status": "affected",
              "version": "06a16293f71927f756dcf37558a79c0b05a91641",
              "versionType": "git"
            },
            {
              "lessThan": "4034ef247a9dde3f56660b01f0c3280dac6b1274",
              "status": "affected",
              "version": "06a16293f71927f756dcf37558a79c0b05a91641",
              "versionType": "git"
            },
            {
              "lessThan": "810e1883d4815f29c30d900ad7333d03cc2515d1",
              "status": "affected",
              "version": "06a16293f71927f756dcf37558a79c0b05a91641",
              "versionType": "git"
            },
            {
              "lessThan": "3abd29c61d2ef37c4102cf755b18be53bb9dbea6",
              "status": "affected",
              "version": "06a16293f71927f756dcf37558a79c0b05a91641",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/input/evdev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.4"
            },
            {
              "lessThan": "4.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-74683",
  "lastModified": "2026-08-25T06:18:51.003",
  "metrics": {},
  "published": "2026-08-22T16:16:42.617",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3abd29c61d2ef37c4102cf755b18be53bb9dbea6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4034ef247a9dde3f56660b01f0c3280dac6b1274"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/433913b4a92214d76e9f0c03ad9128fec943d5f8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5db341189bb7ff041d570dbe36ecca7e32913927"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/810e1883d4815f29c30d900ad7333d03cc2515d1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c79b08d8fa230871a3634e34a66e591ac2d084ef"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f27fa9b39f925d26e034a1f382cb45523138f4ae"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f3fc329acad9a71b3c077237cbac20670d2358c8"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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