Vulnerability details
CVE-2026-5068
zephyrproject-rtos Zephyr
bt: l2cap le coc: remote oob write via seg counter stored in net_buf user_data
CVSS 3.1
7.6High
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.6High | 3.1 | CVEProject cvelistV5 (CNA) (zephyr) | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| zephyrproject-rtos | Zephyr | 1.14.0 ≤ v < 4.3.1 | CVEProject cvelistV5 (CNA) |
References and advisories
1
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Details
- Published
- 2026-06-09
- Last updated
- 2026-10-16
- State
- Published
- Assigner (CNA)
- zephyr
Exploit prediction (EPSS)
0.45%
Probability of exploitation in 30 days
39.3%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-787Out-of-bounds Write