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TI-2026-29051 Aliases CVE-2026-40257

OP-TEE has SHA-3 accelerated finalize heap overflow

Priority LOW 24CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

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`.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00153 4th percentileScored 2026-11-07
Fix Fixed optee_os (OP-TEE): 4.11.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OP-TEEoptee_os3.21.0 to before 4.11.04.11.0Patch availableCNA
  • optee_os VendorOP-TEE Affected 3.21.0 to before 4.11.0 Fixed in 4.11.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:trustedfirmware:op-tee:*:*:*:*:*:*:*:*3.21.0 – 4.10.0VulnerableOP-TEE
  • cpe:2.3:o:trustedfirmware:op-tee:*:*:*:*:*:*:*:* Versions 3.21.0 – 4.10.0 Vulnerable ·OP-TEE

Remediation

  • Fix · CNA optee_os (OP-TEE) Fixed in 4.11.0

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40257

References

Patch 1

  • TI-2022-22796 OP-TEE Trusted OS vulnerable to Improper Validation of Array Index in the cleanup_shm_refs function CVSS 3.1HIGH 8.8
  • TI-2026-29072 OP-TEE has a Use-After-Free race in FF-A shared-memory teardown CVSS 3.1HIGH 7.8
  • TI-2023-21925 OP-TEE double free in shdr_verify_signature CVSS 3.1HIGH 7.4
  • TI-2026-33359 OP-TEE vulnerable to ECDH private key recovery CVSS 3.1MEDIUM 4.7
  • TI-2019-16063 Integer overflow in OP-TEE CVSS 3.0CRITICAL 9.8
  • TI-2019-16062 Integer overflow in OP-TEE CVSS 3.0CRITICAL 9.8
See all 28 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences