CVE-2026-7763 Heap buffer overflow in morse.ko TIM IE processing
Unauthenticated attackers can cause kernel panic or execute code via crafted beacon frames in the Morse Micro HaLowLink 2 Wi-Fi 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-2026-7763?
CVE-2026-7763 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 morse.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 frame containing a malformed Traffic Indication Map (TIM) Information Element. 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, allowing up to 252 bytes of attacker-controlled data to be written beyond the buffer boundary. Because beacons are broadcast frames processed during passive scanning, no authentication, association, or user interaction is required.
Which versions are affected by CVE-2026-7763?
How do I fix CVE-2026-7763?
No fix has been published for CVE-2026-7763 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-2026-7763 being exploited?
There is no known exploitation of CVE-2026-7763 in the wild and no public exploit code.
Sources
Also known as GHSA-wq9p-qhjj-gw6h.