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CVE-2026-31780

7.8 · HIGH

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 t…

Published May 1, 2026CWE-787EPSS 0.19%

Overview

CVE-2026-31780 is a high-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0c7f21d8bd2f93998b72b7a7f93152336aeca4ddRefgit.kernel.org/stable/c/34a23fd9ddd683a03c7e8cc0ceded3e59e354b99Refgit.kernel.org/stable/c/549f02d8ec94d39092ab6d9b103d0d6783a4b024Refgit.kernel.org/stable/c/9907ac9b9a18b92fc34b9e4cb9e10f208dc1d3f7Refgit.kernel.org/stable/c/bfbddeadd4779651403035ee177ae2f22f9f5521Refgit.kernel.org/stable/c/c97b2a00059608592ad0d86fbb813a4f8cf9464bRefgit.kernel.org/stable/c/d049e56b1739101d1c4d81deedb269c52a8dbba0Refgit.kernel.org/stable/c/d8388614de613c28eeb659c10115060a83739924

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31780?

CVE-2026-31780 is a high-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-31780?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-31780?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-31780?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31780 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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