CVE-2026-7762 Heap buffer overflow in dot11ah.ko S1G Capabilities IE processing
Unauthenticated attackers can cause kernel panic or execute code via crafted Wi-Fi frames due to a heap buffer overflow in the HaLow driver.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-7762?
CVE-2026-7762 is a critical memory corruption vulnerability in Morse Micro HaLowLink 2, published on 5 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Which versions are affected by CVE-2026-7762?
How do I fix CVE-2026-7762?
No fix has been published for CVE-2026-7762 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-7762 being exploited?
There is no known exploitation of CVE-2026-7762 in the wild and no public exploit code.
Sources
Also known as GHSA-qm6x-8r68-vvv2.