Vulnerability Details CVE-2026-40257
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`.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 1.5%
CVSS Severity
CVSS v3 Score 5.5
Products affected by CVE-2026-40257
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cpe:2.3:o:trustedfirmware:op-tee:3.21.0
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cpe:2.3:o:trustedfirmware:op-tee:3.22.0
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cpe:2.3:o:trustedfirmware:op-tee:4.0.0
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cpe:2.3:o:trustedfirmware:op-tee:4.1.0
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cpe:2.3:o:trustedfirmware:op-tee:4.10.0
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cpe:2.3:o:trustedfirmware:op-tee:4.2.0
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cpe:2.3:o:trustedfirmware:op-tee:4.3.0
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cpe:2.3:o:trustedfirmware:op-tee:4.4.0
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cpe:2.3:o:trustedfirmware:op-tee:4.5.0
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cpe:2.3:o:trustedfirmware:op-tee:4.6.0
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cpe:2.3:o:trustedfirmware:op-tee:4.7.0
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cpe:2.3:o:trustedfirmware:op-tee:4.8.0
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cpe:2.3:o:trustedfirmware:op-tee:4.9.0