Vulnerability Description
A remote, unauthenticated BLE peer can trigger a 2-byte out-of-bounds write in the Bluetooth host during L2CAP LE CoC SDU reassembly. When the application enables segmentation (via chan_ops.alloc_buf) and the chosen RX pool has a user_data_size smaller than 2 bytes, the segmentation counter stored in the net_buf user_data area is written out of bounds in l2cap_chan_le_recv_seg (subsys/bluetooth/host/l2cap.c). The observed effects are an AddressSanitizer abort and, without ASan, heap corruption / fatal error.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Zephyrproject | Zephyr | <= 4.4.0 |
Related Weaknesses (CWE)
References
- https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-qrcq-hxwj-ExploitPatchVendor Advisory
FAQ
What is CVE-2026-5068?
CVE-2026-5068 is a vulnerability with a CVSS score of 7.6 (HIGH). A remote, unauthenticated BLE peer can trigger a 2-byte out-of-bounds write in the Bluetooth host during L2CAP LE CoC SDU reassembly. When the application enables segmentation (via chan_ops.alloc_buf)...
How severe is CVE-2026-5068?
CVE-2026-5068 has been rated HIGH with a CVSS base score of 7.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-5068?
Check the references section above for vendor advisories and patch information. Affected products include: Zephyrproject Zephyr.