CVE-2026-53763: OP-TEE has AES-GCM 32-bit integer overflow in length counters that breaks authentication guarantee
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.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-53763?
The severity of CVE-2026-53763 is rated as low with a CVSS score of 3.8.
How do I fix CVE-2026-53763?
To fix CVE-2026-53763, apply the patch available for OP-TEE versions prior to 4.11.0.
What causes the issue in CVE-2026-53763?
The issue in CVE-2026-53763 is caused by 32-bit integer overflows in OP-TEE's AES-GCM implementation.
Which versions of OP-TEE are affected by CVE-2026-53763?
CVE-2026-53763 affects OP-TEE versions starting from 3.0.0 up to but not including 4.11.0.
What impact does CVE-2026-53763 have on authentication?
CVE-2026-53763 breaks the authentication guarantee due to integer overflow in length counters.