Numeric Truncation Error in Linux kernel - CVE-2026-80760
Published: September 6, 2026
Vulnerability identifier: #VU147155
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80760
CWE-ID: CWE-197
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause Bluetooth controller packet desynchronization.
The vulnerability exists due to improper numeric truncation in mgmt_hci_cmd_sync when handling HCI_CMD_SYNC commands with a parameter length exceeding the HCI command header field capacity. A local user can send a specially crafted management command to cause Bluetooth controller packet desynchronization.
On length-framed transports such as H:4, trailing parameter bytes can be interpreted as the beginning of the next packet.
Affected software
Linux kernel
How to mitigate CVE-2026-80760
Install security update from vendor's repository.