CVE-2026-5068— bt: l2cap le coc: remote oob write via seg counter stored in net_buf user_data
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| zephyrproject-rtos | Zephyr | 1.14.0≤ 4.3.0 | affected |
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I. Basic Information for CVE-2026-5068
Vulnerability Information
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Vulnerability Title
bt: l2cap le coc: remote oob write via seg counter stored in net_buf user_data
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
Zephyr 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zephyr是Zephyr开源的一个可扩展的实时操作系统 (RTOS)。 Zephyr存在缓冲区错误漏洞，该漏洞源于蓝牙主机L2CAP LE CoC SDU重组过程中2字节越界写入，可能导致远程未经身份验证的BLE对等端触发堆损坏或致命错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| zephyrproject-rtos | Zephyr | 1.14.0 ~ 4.3.0 | - |
II. Public POCs for CVE-2026-5068
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-5068 (1)
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V. Comments for CVE-2026-5068
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