CVE-2026-40257CWE-787

OP-TEE has SHA-3 accelerated finalize heap overflow

Medium · published July 6, 2026

CVSS v3.1
5.5
EPSS
0%
Percentile
4.1
In the wild
Unconfirmed
What it is

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 3.21.0 and prior to version 4.11.0, the ARM Crypto Extensions accelerated SHA-3 implementation has an off-by-one error that can cause a massive heap overflow that corrupts all TEE kernel memory following the hash state. This affects all platforms built with `CFG_CRYPTO_WITH_CE82=y` (ARMv8.2+ with SHA3 Crypto Extensions). Version 4.11.0 contains a patch. As a workaround, disable SHA3 Crypto Extensions with `CFG_CRYPTO_WITH_CE82=n`.

The record
Technical detail
CVSS v3.1
5.5 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00153 · 4.1th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2026-07-06T16:26Z
EPSS history
Timeline
  • 06 JUL 16:26Z
    OP-TEE has SHA-3 accelerated finalize heap overflow
    cvelistv5