CVE-2026-74683 (GCVE-0-2026-74683)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:23
VLAI
Title
Input: evdev - sanitize event type index when fetching event masks
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 06a16293f71927f756dcf37558a79c0b05a91641 , < c79b08d8fa230871a3634e34a66e591ac2d084ef (git)
Affected: 06a16293f71927f756dcf37558a79c0b05a91641 , < f27fa9b39f925d26e034a1f382cb45523138f4ae (git)
Affected: 06a16293f71927f756dcf37558a79c0b05a91641 , < f3fc329acad9a71b3c077237cbac20670d2358c8 (git)
Affected: 06a16293f71927f756dcf37558a79c0b05a91641 , < 5db341189bb7ff041d570dbe36ecca7e32913927 (git)
Affected: 06a16293f71927f756dcf37558a79c0b05a91641 , < 433913b4a92214d76e9f0c03ad9128fec943d5f8 (git)
Affected: 06a16293f71927f756dcf37558a79c0b05a91641 , < 4034ef247a9dde3f56660b01f0c3280dac6b1274 (git)
Affected: 06a16293f71927f756dcf37558a79c0b05a91641 , < 810e1883d4815f29c30d900ad7333d03cc2515d1 (git)
Affected: 06a16293f71927f756dcf37558a79c0b05a91641 , < 3abd29c61d2ef37c4102cf755b18be53bb9dbea6 (git)
Create a notification for this product.
Linux Linux Affected: 4.4
Unaffected: 0 , < 4.4 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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          "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": [
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          "url": "https://git.kernel.org/stable/c/c79b08d8fa230871a3634e34a66e591ac2d084ef"
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          "url": "https://git.kernel.org/stable/c/f27fa9b39f925d26e034a1f382cb45523138f4ae"
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        },
        {
          "url": "https://git.kernel.org/stable/c/3abd29c61d2ef37c4102cf755b18be53bb9dbea6"
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    "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"
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      "date": "2026-10-14",
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        "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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nInput: evdev - sanear el \u00edndice del tipo de evento al obtener m\u00e1scaras de evento\n\nEl \u00edndice del tipo de evento proporcionado por el usuario pasado a los ioctls EVIOCGMASK / EVIOCSMASK se utiliza para indexar el array est\u00e1tico counts en evdev_get_mask_cnt() y el array evmasks del cliente en evdev_get_mask().\n\nSi bien el tipo de evento est\u00e1 arquitect\u00f3nicamente limitado por EV_CNT, la ejecuci\u00f3n especulativa puede predecir err\u00f3neamente las comprobaciones de l\u00edmites y realizar cargas fuera de l\u00edmites.\n\nSanear el \u00edndice del tipo de evento en evdev_get_mask_cnt() sin ramificaciones usando array_index_mask_nospec(). Esto fija el \u00edndice a 0 para un acceso seguro al array y fuerza el recuento devuelto a 0 especulativamente cuando el \u00edndice est\u00e1 fuera de l\u00edmites.\n\nNo necesitamos llamadas adicionales a array_index_nospec() en evdev_get_mask() porque evdev_get_mask_cnt() fuerza especulativamente el recuento (y el xfer_size resultante) a 0 para tipos fuera de l\u00edmites, evitando cualquier acceso especulativo a la memoria al array evmasks del cliente."
          }
        ],
        "id": "CVE-2026-74683",
        "lastModified": "2026-10-14T13:10:00.187",
        "metrics": {},
        "published": "2026-08-22T16:16:42.617",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
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            "url": "https://git.kernel.org/stable/c/5db341189bb7ff041d570dbe36ecca7e32913927"
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            "url": "https://git.kernel.org/stable/c/810e1883d4815f29c30d900ad7333d03cc2515d1"
          },
          {
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            "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"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-24T09:21:44+00:00",
      "cve": "CVE-2026-74683",
      "id": "CVE-2026-74683",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Input: evdev - sanitize event type index when fetching event masks",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74683.json",
      "version": "3"
    }
  }
}



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