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`.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.001 (2.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 2.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000
Affected products
- Op-Tee Optee OS — versions >= 4.5.0, < 4.11.0
- Trustedfirmware Op-Tee
Weakness classification (CWE)
References
- github.com/OP-TEE/optee_os/security/advisories/GHSA-wxp6-8wwr-h4gf (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.