CVE-2026-83838

8.0High

Published 13 Oct 2026 · NVD status: Awaiting Analysis · AI triage by gemini-3.8-flash

8.0High

Attack vector: Adjacent network
Complexity: Low
Privileges needed: Low
User interaction: None
Impact: Full C/I/A compromise
Weakness: CWE-191

Impact

Adjacent authorized attackers can gain elevated privileges on the target system. Exploitation requires Bluetooth proximity and prior authorization/pairing.

Root cause

An integer underflow in the Windows Bluetooth A2DP driver leads to memory corruption.

Affected systems

Versions not listed — check the vendor advisory.

CVSS v3.1 · CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Fix & remediation

Install the relevant Microsoft security update for the Windows Bluetooth A2DP driver from the MSRC advisory; if unable to patch immediately, disable the Bluetooth service (bthserv) or disable the Bluetooth radio.

shell

$ Stop-Service -Name bthserv -PassThru | Set-Service -StartupType Disabled

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

Integer underflow (wrap or wraparound) in Windows Bluetooth A2DP driver allows an authorized attacker to elevate privileges over an adjacent network.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83838

Source: nvd.nist.gov/vuln/detail/CVE-2026-83838