Vulnerability · Published Jun 5, 2026 · Assigned by Bugcrowd
CVE-2026-7762Heap buffer overflow in dot11ah.ko S1G Capabilities IE processing
Critical 9.8
In plain English
A critical-severity security flaw in HaLowLink 2 from Morse Micro. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).
Official description
A heap-based buffer overflow vulnerability in the dot11ah.ko HaLow Wi-Fi kernel driver in Morse Micro HaLowLink 2 software versions prior to 2.11.13 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Morse Micro | HaLowLink 2 | 0 – before 2.11.13 |