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Medium · 5.5 CVE-2026-40257 EUVD-2026-41891

OP-TEE has SHA-3 accelerated finalize heap overflow

Published Jul 6, 2026 · Updated Jul 6, 2026 · Assigned by GitHub_M

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`.

Affected products

VendorProductAffectedFixed
OP-TEE optee_os >= 3.21.0, < 4.11.0 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 13 optee-os No fix yet —
ReleasePackageFixed inAdvisory
Ubuntu 26.10 optee-os No fix yet —
Ubuntu 26.04 LTS optee-os No fix yet —
Ubuntu 25.10 optee-os No fix yet —

References