Phison PS3111-S11 Controller Firmware Missing Authentication on Vendor Unique Commands

Advisories

Phison PS3111-S11 Controller Firmware Missing Authentication on Vendor Unique Commands

severity: critical
date: 9/1/2026
Affecting: PS3111-S11 Controller Firmware <= SBFQT1.3
CVE: CVE-2026-84696
CWE: CWE-306 Missing Authentication for Critical Function
CVSS: 9.3
CVSS V4 Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
References: https://trulycrisp.github.io/drivefirmware/phison_s11/
https://github.com/trulycrisp/psychite
https://github.com/trulycrisp/disksec
Credit: Michael Herbert
Description: Phison PS3111-S11 controller firmware versions through SBFQT1.3 expose privileged vendor unique commands over the ATA interface with absent or defeatable authentication mechanisms. Attackers can bypass the weak CRC-16 based unlock handshake or exploit builds with no VUC lock to read and write controller memory and raw flash, persisting implants across power cycles.

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