Windows USB Audio CVE-2026-69707

The attacker must have an authenticated local session on the target Windows system with at least standard user (low) privileges - remote unauthenticated exploitation is not possible per the AV:L/PR:L CVSS vector. The vulnerability is in the USB Audio Class kernel driver (usbaudio.sys), so some form of interaction with that driver - likely attaching a USB audio device or sending crafted IOCTL requests to the driver interface - is required to trigger the integer overflow. No special non-default configuration is required beyond the driver being loaded, which occurs automatically on Windows systems with USB audio devices present. Exploitation is limited to local access: remote attackers cannot reach this attack surface without first compromising a local session through other means. The driver is present on all affected Windows versions by default, so no administrator enablement is required.

The CVSS 3.1 vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H accurately captures the threat profile: exploitation is local, requires only a standard user account, involves no user interaction, and yields complete compromise of confidentiality, integrity, and availability on the affected system. The low attack complexity is the key risk amplifier - once an attacker has any foothold on a vulnerable Windows host (e.g., via phishing, supply-chain compromise, or legitimate user account), privilege escalation to SYSTEM is straightforward with no additional setup. No public exploit code or CISA KEV entry has been identified, and the EPSS data is not supplied, so exploitation probability cannot be quantified numerically. However, local privilege escalation primitives in Windows kernel audio drivers have historically been packaged into post-exploitation toolkits (e.g., for ransomware deployment or sandbox escape), making patch timing important. The extremely wide affected version range - 19 distinct Windows and Windows Server SKUs - substantially increases aggregate exposure across enterprise environments.

A low-privileged attacker with a local shell on a vulnerable Windows system - obtained via phishing, lateral movement, or a standard user account - attaches or emulates a USB audio device and sends crafted data that triggers an integer overflow in usbaudio.sys during driver processing. The overflow corrupts kernel memory structures, enabling the attacker to execute arbitrary code in kernel context and elevate their session to SYSTEM privileges, facilitating full host takeover. No public exploit code has been identified at time of analysis, but the AC:L rating suggests the exploitation path is not highly complex once the overflow primitive is understood.