Vulnerability in Op-Tee Optee OS
CVE-2026-41516
OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on Arm; Cortex-A cores using the TrustZone technology. Starting in version 4.5.0 and prior to version 4.11.0, the RSA PKCS#1 v1.5 decryption implementation in the Hisilicon HPRE crypto driver uses non-constant-time `memcmp()` for label hash verification and has multiple distinguishable error paths. This creates a Bleichenbacher-style padding oracle that allows an attacker to recover RSA PKCS#1 v1.5 plaintext. Version 4.11.0 contains a patch. As a workaround, disable Hisilicon HPRE RSA driver with `CFG_HISILICON_ACC_V3=n`.
EPSS: 0.001 (3.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 2.5 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Op-tee Optee_os — versions >= 4.5.0, < 4.11.0
- Trustedfirmware Op-tee
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Patch, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-41516?
- CVE-2026-41516 is a low-severity vulnerability in Op-Tee Optee OS, classified under CWE-208. CVSS score: 2.5/10. Published 2026-07-06.
- How severe is CVE-2026-41516?
- Low severity. CVSS v3 base score is 2.5 out of 10.