Vulnerability DatabaseCVE-2026-5068
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CVE-2026-5068
Published:June 09, 2026
Updated:August 04, 2026
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.
Affected Packages
https://github.com/zephyrproject-rtos/zephyr.git (GITHUB):
Affected version(s) >=v1.0.0 <v4.4.1
Fix Suggestion:
Update to version v4.4.1
Related Resources (4)
https://github.com/zephyrproject-rtos/zephyr
https://nvd.nist.gov/vuln/detail/CVE-2026-5068
https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-qrcq-hxwj-mqxm
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5068.json
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CVSS v4
Base Score:
7.2
Attack Vector
ADJACENT
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.6
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
HIGH
Weakness Type (CWE)
Out-of-bounds Write
CWE-787
EPSS
Base Score:
0.45