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    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`.

    Published:Jul 6, 2026
    Last Modified:Jul 6, 2026
    EPS:Jul 6, 2026
    EPSS Score:
    CVSS Score:5.5

    Affected Products

    Vendor
    Op-tee
    Product
    Op-tee Os

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-71969 (CVSS 8.4) — OP-TEE OS through 4.10.0, fixed in commit 7b8b494, contains a buffer underwrite vulnerability in the RSA NOPAD…
    CVE-2026-71968 (CVSS 8.4) — OP-TEE OS through 4.10.0, fixed in commit 8794043, contains a use-after-free vulnerability in the Trusted Appl…
    CVE-2026-71967 (CVSS 5.7) — OP-TEE OS through 4.10.0, fixed in commit 0aadfc2, contains a null pointer dereference vulnerability in the Wi…
    CVE-2026-53763 (CVSS 3.8) — OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on …
    CVE-2026-44362 (CVSS 5.5) — OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on …
    CVE-2026-42546 (CVSS 3.8) — OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on …
    CVE-2026-41516 (CVSS 2.5) — OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on …
    CVE-2026-41515 (CVSS 2.5) — OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on …
    CVE-2026-41514 (CVSS 2.5) — OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on …
    CVE-2026-41434 (CVSS 3.3) — OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High