CVE-2026-79982 Zephyr Bluetooth - Buffer Overflow

Zephyr Bluetooth HCI USB transport class contains a buffer overflow caused by copying oversized HCI packets into fixed-size USB transfer buffers without length checks, letting unauthenticated Bluetooth attackers cause memory corruption or denial of service, exploit requires attacker within Bluetooth range sending oversized HCI packets.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.38% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Remote Code Execution, Denial Of Service
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
23 October 2026
Updated
25 October 2026
Weakness
CWE-787

Vendor fix

Update to the latest Zephyr version with the bt_hci_tx_pool fix that properly bounds USB transfer buffers.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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