# CVE-2026-33662

> Vulnerability · severity: **HIGH** (CVSS 7.5).

## Description

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. From 3.8.0 to 4.10, in the function emsa_pkcs1_v1_5_encode() in core/drivers/crypto/crypto_api/acipher/rsassa.c, the amount of padding needed, "PS size", is calculated by subtracting the size of the digest and other fields required for the EMA-PKCS1-v1_5 encoding from the size of the modulus of the key. By selecting a small enough modulus, this subtraction can overflow. The padding is added as a string of 0xFF bytes with a call to memset(), and an underflowed integer will cause the memset() call to overwrite until OP-TEE crashes. This only affects platforms registering RSA acceleration.

## Key facts

- **CVE ID:** CVE-2026-33662
- **Published:** 2026-04-24
- **CVSS severity:** HIGH
- **CVSS base score:** 7.5
- **CWE codes:** CWE-190

## Affected products

- `linaro:op-tee`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33662

## Citation

> AI Analytics. CVE-2026-33662. Retrieved 2026-07-23 from https://api.ai-analytics.org/cve/CVE-2026-33662. Derived from NIST NVD. Licensed CC0.

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