Is there a public exploit for CVE-2026-85034?

No public exploit for CVE-2026-85034 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-85034?

CVE-2026-85034 scores CVSS 6.7 (v3.1), rated medium.

What does CVE-2026-85034 affect?

CVE-2026-85034 affects zephyrproject Zephyr.

6.7 Medium

The Bluetooth host's GATT client passed the value of a received Handle Value Notification, Handle Value Indication or Multiple Handle Value…

CVE-2026-85034

The Bluetooth host's GATT client passed the value of a received Handle Value Notification, Handle Value Indication or Multiple Handle Value Notification to btgattsubscribeparams::notify callbacks using only the length derived from the received ATT PDU. btattrecv() in subsys/bluetooth/host/att.c validates only a minimum PDU length and does not enforce the negotiated ATT MTU, and the fixed ATT L2CAP channel in subsys/bluetooth/host/l2cap.c applies no rx.mtu check either, so the only ceiling was the ACL reassembly buffer CONFIGBTBUFACLRXSIZE. Values longer than the 512-octet maximum attribute length defined by the Bluetooth Core Specification (Vol 3, Part F, Section 3.2.9) could therefore be handed to subscribers that size their buffers to that documented limit. A remote peer that a device has connected and subscribed to — a malicious, spoofed or compromised GATT server within radio range — triggers the flaw by sending a notification or indication whose value exceeds 512 octets on a subscribed handle. In the LE Audio unicast client this reaches a concrete out-of-bounds write: unicastclientepnotify() in subsys/bluetooth/audio/bapunicastclient.c copies the notification into the…

Assessment

CVSS: 6.7 (v3.1)
Severity: Medium
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 3 November 2026
Last updated: 3 November 2026
Affected: zephyrproject · Zephyr
Assigner: zephyr

CVSS vectorCVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:H

At the source

EUVD (ENISA)

References

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