CVE-2026-84696

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

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.

Affected

Phison Electronics Corporation · PS3111-S11 Controller Firmware

CVSS v4.0 VULNCHECK

9.3 CRITICALCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 VULNCHECK

8.2 HIGHCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS

0.15% chance of exploitation in the next 30 days, 4th percentile

Published

2026-09-02

Proof-of-concept exploits (2)

• trulycrisp/psychite
• trulycrisp/disksec

References

• CVE Record
• NVD entry

Related

• CVE-2026-82876