CVE-2026-40257

MEDIUM

OP-TEE >= 3.21.0, < 4.11.0 SHA-3 - Heap Overflow

Title source: manual
STIX 2.1

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. 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`.

References (1)

Core 1
Core References

Scores

CVSS v3 5.5
EPSS 0.0011
EPSS Percentile 1.4%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-787
Status published
Products (2)
OP-TEE/optee_os >= 3.21.0, < 4.11.0
trustedfirmware/op-tee 3.21.0 - 4.10.0
Published Jul 06, 2026
Tracked Since Jul 06, 2026