Is CVE-2026-31773 actively exploited?

No active exploitation of CVE-2026-31773 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-31773 be exploited remotely?

Partially. CVE-2026-31773 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2026-31773?

CVE-2026-31773 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2026-31773

Published: May 1, 2026· Updated: May 3, 2026

8.8

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:9.5th

Official Description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: SMP: derive legacy responder STK authentication from MITM state

The legacy responder path in smp_random() currently labels the stored

STK as authenticated whenever pending_sec_level is BT_SECURITY_HIGH.

That reflects what the local service requested, not what the pairing

flow actually achieved.

For Just Works/Confirm legacy pairing, SMP_FLAG_MITM_AUTH stays clear

and the resulting STK should remain unauthenticated even if the local

side requested HIGH security. Use the established MITM state when

storing the responder STK so the key metadata matches the pairing result.

This also keeps the legacy path aligned with the Secure Connections code,

which already treats JUST_WORKS/JUST_CFM as unauthenticated.

NVD Source

Technical Analysis

CVE-2026-31773 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.