CVE-2026-74683 (GCVE-0-2026-74683)
Vulnerability from cvelistv5
Published
2026-08-22 15:32
Modified
2026-08-25 05:23
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
Impacted products
Vendor Product Version
Linux Linux Version: 06a16293f71927f756dcf37558a79c0b05a91641
Version: 06a16293f71927f756dcf37558a79c0b05a91641
Version: 06a16293f71927f756dcf37558a79c0b05a91641
Version: 06a16293f71927f756dcf37558a79c0b05a91641
Version: 06a16293f71927f756dcf37558a79c0b05a91641
Version: 06a16293f71927f756dcf37558a79c0b05a91641
Version: 06a16293f71927f756dcf37558a79c0b05a91641
Version: 06a16293f71927f756dcf37558a79c0b05a91641
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/input/evdev.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "4.4"
            },
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              "status": "unaffected",
              "version": "0",
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              "version": "5.10.265",
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            },
            {
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              "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"
            },
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              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:23:19.336Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c79b08d8fa230871a3634e34a66e591ac2d084ef"
        },
        {
          "url": "https://git.kernel.org/stable/c/f27fa9b39f925d26e034a1f382cb45523138f4ae"
        },
        {
          "url": "https://git.kernel.org/stable/c/f3fc329acad9a71b3c077237cbac20670d2358c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/5db341189bb7ff041d570dbe36ecca7e32913927"
        },
        {
          "url": "https://git.kernel.org/stable/c/433913b4a92214d76e9f0c03ad9128fec943d5f8"
        },
        {
          "url": "https://git.kernel.org/stable/c/4034ef247a9dde3f56660b01f0c3280dac6b1274"
        },
        {
          "url": "https://git.kernel.org/stable/c/810e1883d4815f29c30d900ad7333d03cc2515d1"
        },
        {
          "url": "https://git.kernel.org/stable/c/3abd29c61d2ef37c4102cf755b18be53bb9dbea6"
        }
      ],
      "title": "Input: evdev - sanitize event type index when fetching event masks",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74683",
    "datePublished": "2026-08-22T15:32:50.192Z",
    "dateReserved": "2026-08-15T05:44:03.926Z",
    "dateUpdated": "2026-08-25T05:23:19.336Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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