(Pwn2Own) Kenwood DNR1007XR tchdr_bytestream_read Out-Of-Bounds Write Code Execution Vulnerability

July 29th, 2026
ZDI-26-486 ZDI-CAN-28980

CVE ID

CVE-2026-18269

CVSS Score

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

Affected Vendors

Kenwood

Affected Products

DNR1007XR

Vulnerability Details

This vulnerability allows physically present attackers to execute arbitrary code on affected installations of Kenwood DNR1007XR devices. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the tchdr_bytestream_read function. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of root.

Additional Details

Kenwood has issued an update to correct this vulnerability. More details can be found at:
https://www.kenwood.com/cs/ce/mm/firmware/2020/2020f/eng.html

Disclosure Timeline

  • 2026-02-03 - Vulnerability reported to vendor
  • 2026-07-29 - Coordinated public release of advisory
  • 2026-07-29 - Advisory Updated

Credit

Yannik Marchand

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