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CVE-2026-7763 Morse Micro CVE debrief

CVE-2026-7763 is a critical heap-based buffer overflow vulnerability in the morse.ko HaLow Wi-Fi kernel driver in Morse Micro HaLowLink 2 software versions prior to 2.11.13. An unauthenticated attacker within radio range can cause a Denial of Service (kernel panic) or potentially achieve Remote Code Execution via a crafted 802.11ah beacon frame containing a malformed Traffic Indication Map (TIM) Information Element. The vulnerability exists because the function morse_page_slicing_process_tim_element() in page_slicing.c derives the TIM bitmap length directly from a received IE field without validating it against the fixed-size destination buffer before passing it to memset and memcpy operations. This allows up to 252 bytes of attacker-controlled data to be written beyond the buffer boundary. Beacons are broadcast frames processed during passive scanning, requiring no 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 patch to prevent exploitation.

Technical summary

The morse.ko HaLow Wi-Fi kernel driver in Morse Micro HaLowLink 2 software versions prior to 2.11.13 is vulnerable to a heap-based buffer overflow. The function morse_page_slicing_process_tim_element() in page_slicing.c is affected, allowing an attacker to write up to 252 bytes of controlled data beyond the buffer boundary.

Defensive priority

High

Recommended defensive actions

  • Apply the patch: Upgrade to Morse Micro HaLowLink 2 software version 2.11.13 or later.
  • Review and follow the vendor's security advisory: [MM-SA-2026-001](resourceLinkAnnotations:ref-4)

Evidence notes

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

Sources and references

Verified primary and authoritative sources

  • CVE-2026-7763 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-7763

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

  • CVE-2026-7763 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-7763

    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-2026-001

    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.