CVE-2024-7726: Arbitrary Code execution via exposed JTAG port in Kioxia CM6, PM6, PM7

Severity: medium (CVSS 6.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-12-20 · updated 2026-06-17
Weakness: CWE-306

Description

There exists an unauthenticated accessible JTAG port on the Kioxia PM6, PM7 and CM6 devices - On the Kioxia CM6, PM6 and PM7 disk drives it was discovered that the 2 main CPU cores of the SoC can be accessed via an open JTAG debug port that is exposed on the drive’s circuit board. Due to the wide cutout of the enclosures, the JTAG port can be accessed without having to open the disk enclosure. Utilizing the JTAG debug port, an attacker with (temporary) physical access can get full access to the firmware and memory on the 2 main CPU cores within the drive including the execution of arbitrary code, the modification of firmware execution flow and data or bypassing the firmware signature verification during boot-up.

Affected products

Kioxia Cm6 Firmware: through gpk5
Kioxia Pm6 Firmware: through bd0d
Kioxia Pm7 Firmware: through c40a

References

https://github.com/google/security-research/security/advisories/GHSA-3hh8-94j4-62rh

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