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

Quick assessment

Affected
OP-TEE optee_os
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OP-TEE optee_os是OP-TEE的安全操作系统。 OP-TEE optee_os 3.21.0版本至4.11.0之前版本存在缓冲区错误漏洞，该漏洞源于ARM Crypto Extensions加速SHA-3实现中存在差一错误，可能导致堆溢出，从而破坏哈希状态之后的所有TEE内核内存。

CVSS 5.5 · Medium EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
OP-TEE optee_os >= 3.21.0, < 4.11.0 affected
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I. Basic Information for CVE-2026-40257

Vulnerability Information
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Vulnerability Title
OP-TEE has SHA-3 accelerated finalize heap overflow
Source: CVE Program / CVE List V5
Vulnerability 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`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
OP-TEE optee_os 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OP-TEE optee_os是OP-TEE的安全操作系统。 OP-TEE optee_os 3.21.0版本至4.11.0之前版本存在缓冲区错误漏洞，该漏洞源于ARM Crypto Extensions加速SHA-3实现中存在差一错误，可能导致堆溢出，从而破坏哈希状态之后的所有TEE内核内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OP-TEE optee_os >= 3.21.0, < 4.11.0 -

II. Public POCs for CVE-2026-40257

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III. Intelligence Information for CVE-2026-40257

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Vendor Advisories for CVE-2026-40257 (1)

Same Patch Batch · OP-TEE · 2026-07-06 · 8 CVEs total

CVE-2026-44362 5.5 MEDIUM OP-TEE's subkey rollback protection can be bypassed with older subkey versions
CVE-2026-42546 3.8 LOW OP-TEE has missing OPTEE_MSG_ATTR_TYPE_MASK in cleanup_shm_refs() leaks mobj references
CVE-2026-41434 3.3 LOW OP-TEE has unbounded recursion in sanitize_client_object()
CVE-2026-41514 2.5 LOW OP-TEE: RSA-OAEP padding oracle in Hisilicon HPRE driver enables plaintext recovery
CVE-2026-41516 2.5 LOW OP-TEE: Hisilicon HPRE PKCS#1 v1.5 Decryption Padding Oracle
CVE-2026-41515 2.5 LOW OP-TEE: RSA-OAEP padding oracle in NXP CAAM driver enables plaintext recovery
CVE-2026-53763 OP-TEE has AES-GCM 32-bit integer overflow in length counters that breaks authentication g

IV. Related Vulnerabilities

Same product: optee_os
Same vendor: OP-TEE
Same weakness: CWE-787

V. Comments for CVE-2026-40257

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