CVE-2026-31780

Kernel memory corruption via SSID size wraparound

Published May 1, 2026 · Updated May 1, 2026

Heap buffer overflow in the wilc1000 Wi-Fi driver in Linux Kernel allows local users to corrupt kernel memory through an SSID scan. In hif.c, the u8 valuesize accumulator wraps after ten maximum-length SSIDs, so kmalloc reserves 75 bytes before memcpy writes as many as 331. The path requires local access and an active WILC1000 interface; the overwrite can crash the system or alter privileged kernel state.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in the wilc1000 Wi-Fi driver in Linux Kernel allows local users to corrupt kernel memory through an SSID scan. In hif.c, the u8 valuesize accumulator wraps after ten maximum-length SSIDs, so kmalloc reserves 75 bytes before memcpy writes as many as 331. The path requires local access and an active WILC1000 interface; the overwrite can crash the system or alter privileged kernel state.

The record

CVE
CVE-2026-31780
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.2
  2. Affected versionversion=c5c77ba18ea66aa05441c71e38473efb787705a4 <0c7f21d8bd2f93998b72b7a7f93152336aeca4dd
  3. Affected versionversion=c5c77ba18ea66aa05441c71e38473efb787705a4 <34a23fd9ddd683a03c7e8cc0ceded3e59e354b99
  4. Affected versionversion=c5c77ba18ea66aa05441c71e38473efb787705a4 <549f02d8ec94d39092ab6d9b103d0d6783a4b024
  5. Affected versionversion=c5c77ba18ea66aa05441c71e38473efb787705a4 <9907ac9b9a18b92fc34b9e4cb9e10f208dc1d3f7
  6. Affected versionversion=c5c77ba18ea66aa05441c71e38473efb787705a4 <bfbddeadd4779651403035ee177ae2f22f9f5521
  7. Affected versionversion=c5c77ba18ea66aa05441c71e38473efb787705a4 <c97b2a00059608592ad0d86fbb813a4f8cf9464b
  8. Affected versionversion=c5c77ba18ea66aa05441c71e38473efb787705a4 <d049e56b1739101d1c4d81deedb269c52a8dbba0
  9. Affected versionversion=c5c77ba18ea66aa05441c71e38473efb787705a4 <d8388614de613c28eeb659c10115060a83739924

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.2; version=c5c77ba18ea66aa05441c71e38473efb787705a4 <0c7f21d8bd2f93998b72b7a7f93152336aeca4dd; version=c5c77ba18ea66aa05441c71e38473efb787705a4 <34a23fd9ddd683a03c7e8cc0ceded3e59e354b99; version=c5c77ba18ea66aa05441c71e38473efb787705a4 <549f02d8ec94d39092ab6d9b103d0d6783a4b024; version=c5c77ba18ea66aa05441c71e38473efb787705a4 <9907ac9b9a18b92fc34b9e4cb9e10f208dc1d3f7; version=c5c77ba18ea66aa05441c71e38473efb787705a4 <bfbddeadd4779651403035ee177ae2f22f9f5521; version=c5c77ba18ea66aa05441c71e38473efb787705a4 <c97b2a00059608592ad0d86fbb813a4f8cf9464b; version=c5c77ba18ea66aa05441c71e38473efb787705a4 <d049e56b1739101d1c4d81deedb269c52a8dbba0; version=c5c77ba18ea66aa05441c71e38473efb787705a4 <d8388614de613c28eeb659c10115060a83739924

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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