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 CPE status
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)
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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)
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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."
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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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      "cve": "CVE-2026-74683",
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/input/evdev.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"06a16293f71927f756dcf37558a79c0b05a91641\",\"lessThan\":\"c79b08d8fa230871a3634e34a66e591ac2d084ef\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"06a16293f71927f756dcf37558a79c0b05a91641\",\"lessThan\":\"f27fa9b39f925d26e034a1f382cb45523138f4ae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"06a16293f71927f756dcf37558a79c0b05a91641\",\"lessThan\":\"f3fc329acad9a71b3c077237cbac20670d2358c8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"06a16293f71927f756dcf37558a79c0b05a91641\",\"lessThan\":\"5db341189bb7ff041d570dbe36ecca7e32913927\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"06a16293f71927f756dcf37558a79c0b05a91641\",\"lessThan\":\"433913b4a92214d76e9f0c03ad9128fec943d5f8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"06a16293f71927f756dcf37558a79c0b05a91641\",\"lessThan\":\"4034ef247a9dde3f56660b01f0c3280dac6b1274\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"06a16293f71927f756dcf37558a79c0b05a91641\",\"lessThan\":\"810e1883d4815f29c30d900ad7333d03cc2515d1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"06a16293f71927f756dcf37558a79c0b05a91641\",\"lessThan\":\"3abd29c61d2ef37c4102cf755b18be53bb9dbea6\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/input/evdev.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "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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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.