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OpenAdvisories
Low · 3.8 CVE-2026-53763 EUVD-2026-41912

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

Published Jul 6, 2026 · Updated Jul 7, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
OP-TEE optee_os >= 3.0.0, < 4.11.0 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 13 optee-os No fix yet —
ReleasePackageFixed inAdvisory
Ubuntu 26.10 optee-os No fix yet —
Ubuntu 26.04 LTS optee-os No fix yet —
Ubuntu 25.10 optee-os No fix yet —

References