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CVE-2026-7762 Morse Micro CVE debrief

A heap-based buffer overflow vulnerability exists in the dot11ah.ko HaLow Wi-Fi kernel driver in Morse Micro HaLowLink 2 software versions prior to 2.11.13. This vulnerability allows an unauthenticated attacker within radio range to cause a Denial of Service (kernel panic) or potentially achieve Remote Code Execution via a crafted 802.11ah beacon or probe response frame containing a malformed S1G Capabilities Information Element (IE element ID 0xD9). The function morse_dot11ah_find_s1g_caps_for_bssid() uses the IE length field directly as the size argument to memcpy without validating it against the 15-byte destination buffer. An attacker can supply up to 255 bytes, causing an overflow of up to 240 bytes of attacker-controlled data into adjacent kernel heap memory. The vulnerability is triggerable during normal scanning without authentication, association, or user interaction.

Vendor
Morse Micro
Product
HaLowLink 2
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-05
Original CVE updated
2026-07-23
Advisory published
2026-06-05
Advisory updated
2026-07-23

Who should care

Users of Morse Micro HaLowLink 2 software versions prior to 2.11.13 should apply the necessary patches to prevent exploitation of this vulnerability.

Technical summary

The vulnerability is caused by the lack of validation of the IE length field in the morse_dot11ah_find_s1g_caps_for_bssid() function. This allows an attacker to supply a large amount of data, causing a buffer overflow in the kernel heap memory.

Defensive priority

High

Recommended defensive actions

  • Apply the patch: Upgrade to Morse Micro HaLowLink 2 software version 2.11.13 or later.
  • Refer to vendor advisory: [MM-SA-2026-002](resourceLinkAnnotations:ref-4)

Evidence notes

The CVE record and NVD detail pages provide additional information about this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-7762 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-7762

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-7762 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-7762

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://www.morsemicro.com/security-advisories/MM-SA-2026-002

    4ac701fe-44e9-4bcd-9585-dd6449257611

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.