(Pwn2Own) Sony XAV-9500ES udev USB Rules Authorization Bypass Vulnerability

July 29th, 2026
ZDI-26-476 ZDI-CAN-28992

CVE ID

CVE-2026-18283

CVSS Score

2.4 AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected Vendors

Sony

Affected Products

XAV-9500ES

Vulnerability Details

This vulnerability allows physically present attackers to bypass authorization on affected installations on Sony XAV-9500ES devices. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the udev rules. A crafted USB device connected to the system can trigger instantiation of otherwise restricted USB device types. An attacker can leverage this vulnerability to bypass authorization on the system.

Additional Details

Sony has issued an update to correct this vulnerability. More details can be found at:
https://www.sony.com/electronics/support/mobile-cd-players-digital-media-players-xav-series/xav-9500es/software/00274922

Disclosure Timeline

  • 2026-03-19 - Vulnerability reported to vendor
  • 2026-07-29 - Coordinated public release of advisory
  • 2026-07-29 - Advisory Updated

Credit

Synacktiv

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