References to Advisories, Solutions, and Tools

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{"timestamp":"2026-07-06T18:57:28.891502Z","id":"CVE-2026-40257","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

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`.

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-787

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

[{"vendor":"OP-TEE","product":"optee_os","versions":[{"version":">= 3.21.0, < 4.11.0","status":"affected"}]}]