CVE-2026-40257 — OP-TEE has SHA-3 accelerated finalize heap overflow

Description (CNA)

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`.

Affected (CNA)

Vendor / product	Versions
OP-TEE / optee_os	affected >= 3.21.0, < 4.11.0

CWE

CWE-787

References

https://github.com/OP-TEE/optee_os/security/advisories/GHSA-75x4-j8p9-55qv

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.