CVE-2026-31780 (GCVE-0-2026-31780)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:15 – Updated: 2026-05-03 05:45
VLAI?
Title
wifi: wilc1000: fix u8 overflow in SSID scan buffer size calculation
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: wilc1000: fix u8 overflow in SSID scan buffer size calculation The variable valuesize is declared as u8 but accumulates the total length of all SSIDs to scan. Each SSID contributes up to 33 bytes (IEEE80211_MAX_SSID_LEN + 1), and with WILC_MAX_NUM_PROBED_SSID (10) SSIDs the total can reach 330, which wraps around to 74 when stored in a u8. This causes kmalloc to allocate only 75 bytes while the subsequent memcpy writes up to 331 bytes into the buffer, resulting in a 256-byte heap buffer overflow. Widen valuesize from u8 to u32 to accommodate the full range.
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c5c77ba18ea66aa05441c71e38473efb787705a4 , < 34a23fd9ddd683a03c7e8cc0ceded3e59e354b99 (git)
Affected: c5c77ba18ea66aa05441c71e38473efb787705a4 , < 549f02d8ec94d39092ab6d9b103d0d6783a4b024 (git)
Affected: c5c77ba18ea66aa05441c71e38473efb787705a4 , < bfbddeadd4779651403035ee177ae2f22f9f5521 (git)
Affected: c5c77ba18ea66aa05441c71e38473efb787705a4 , < 9907ac9b9a18b92fc34b9e4cb9e10f208dc1d3f7 (git)
Affected: c5c77ba18ea66aa05441c71e38473efb787705a4 , < c97b2a00059608592ad0d86fbb813a4f8cf9464b (git)
Affected: c5c77ba18ea66aa05441c71e38473efb787705a4 , < d8388614de613c28eeb659c10115060a83739924 (git)
Affected: c5c77ba18ea66aa05441c71e38473efb787705a4 , < 0c7f21d8bd2f93998b72b7a7f93152336aeca4dd (git)
Affected: c5c77ba18ea66aa05441c71e38473efb787705a4 , < d049e56b1739101d1c4d81deedb269c52a8dbba0 (git)
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    Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/microchip/wilc1000/hif.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: wilc1000: fix u8 overflow in SSID scan buffer size calculation\n\nThe variable valuesize is declared as u8 but accumulates the total\nlength of all SSIDs to scan. Each SSID contributes up to 33 bytes\n(IEEE80211_MAX_SSID_LEN + 1), and with WILC_MAX_NUM_PROBED_SSID (10)\nSSIDs the total can reach 330, which wraps around to 74 when stored\nin a u8.\n\nThis causes kmalloc to allocate only 75 bytes while the subsequent\nmemcpy writes up to 331 bytes into the buffer, resulting in a 256-byte\nheap buffer overflow.\n\nWiden valuesize from u8 to u32 to accommodate the full range."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "dateReserved": "2026-03-09T15:48:24.141Z",
    "dateUpdated": "2026-05-03T05:45:57.457Z",
    "state": "PUBLISHED"
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      "date": "2026-05-07",
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  }
}


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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.



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