CVE-2026-53763

OP-TEE has AES-GCM 32-bit integer overflow in length counters that breaks authentication guarantee

State: Published
Severity: 3.8 Low
Published: Jul 6, 2026
Updated: Jul 7, 2026
Reserved: Jun 10, 2026

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 3.0.0 and prior to version 4.11.0, 32-bit integer overflows in OP-TEE core's AES-GCM implementation cause the authentication tag to be computed with incorrect bit-length values after processing more than 512 megabytes of payload or Additional Authenticated Data (AAD). Version 4.11.0 contains a patch. No known workarounds are available.

Scores

CVSS	Score	Vector	Source
3.0	3.8 Low	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N	GitHub_M

Weaknesses

CWE-190 Integer Overflow or Wraparound

Affected Products

Product	Versions
optee_osOP-TEE	>= 3.0.0, < 4.11.0Affected

References

https://github.com/OP-TEE/optee_os/security/advisories/GHSA-fcm8-vjhf-6vqh

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