Is CVE-2026-82388 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-82388 being exploited in the wild.

How severe is CVE-2026-82388?

Medium severity, with a CVSS score of 5.3, published 26 October 2026.

Which products and versions are affected?

Zephyr OS versions with CONFIG_BT_CLASSIC and CONFIG_BT_HFP_HF enabled.

How is CVE-2026-82388 attacked?

It is attacked over the network, in an operating system.

Am I affected by CVE-2026-82388?

Check whether you run Zephyr OS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-82388: Zephyr HFP Hands-Free connection denial of service

CVE-2026-82388 · Severity: medium · CVSS 5.3 · Published 2026-10-26

Zephyr's Bluetooth Hands-Free Profile implementation has a flaw in connection setup that can be triggered by a malicious remote Bluetooth device or by network timing conditions. When connection initialization fails, the code incorrectly wipes the connection object while a background service discovery operation still references it, causing the Bluetooth stack to hang or crash and denying service to legitimate Bluetooth connections.

Technologies: Zephyr OS. Vendors: Zephyr.

Quick answers

Is CVE-2026-82388 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-82388 being exploited in the wild.
How severe is CVE-2026-82388?: Medium severity, with a CVSS score of 5.3, published 26 October 2026.
Which products and versions are affected?: Zephyr OS versions with CONFIG_BT_CLASSIC and CONFIG_BT_HFP_HF enabled.
Is there a fix for CVE-2026-82388?: No fixed version is recorded yet. Disable Bluetooth HFP Hands-Free support (CONFIG_BT_HFP_HF) if not required; restrict Bluetooth pairing and connection to trusted devices only to limit exposure to malicious SDP records.</anigation> </invoke> If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-82388 attacked?: It is attacked over the network, in an operating system.
Am I affected by CVE-2026-82388?: Check whether you run Zephyr OS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Disable Bluetooth HFP Hands-Free support (CONFIG_BT_HFP_HF) if not required; restrict Bluetooth pairing and connection to trusted devices only to limit exposure to malicious SDP records.</anigation> </invoke>

Technical details

The bt_hfp_hf_connect() function in subsys/bluetooth/host/classic/hfp_hf.c allocates a Hands-Free object and starts an SDP discovery by passing an embedded parameter block to bt_sdp_discover(), which links the block into the SDP client's request list. If the subsequent RFCOMM connection fails (due to invalid channel parameters from the peer's SDP record, RFCOMM session state, or ACL drop), the code memset()s the entire object to zero while discovery is still pending, corrupting list pointers and function pointers that the SDP receive paths later dereference without NULL checks. This causes the Bluetooth host thread to hang in a corrupted list walk or fault on null pointer dereference, reaching denial of service.

Affected products

Zephyr Zephyr OS versions with CONFIG_BT_CLASSIC and CONFIG_BT_HFP_HF enabled

Timeline

2026-10-26: disclosed

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