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CVE-2026-53763

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

3.8 Low

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
None

Exploit likelihood

0.19%Up 0.2 points since Jun 12, 2026
90%50%10%1%

What each source reports

CVE List Score used 3.8

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.

Record
CVE-2026-53763
CVSS 3.0
3.8 LowCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
Weakness
CWE-190
Updated
2026-11-02
EUVDEUVD-2026-41912 3.8

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.

Record
EUVD-2026-41912
CVSS 3.0
3.8 LowCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
Updated
2026-11-02
NVD 3.8

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.

Record
CVE-2026-53763
CVSS 3.0
3.8 LowCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
Weakness
CWE-190
Updated
2026-11-02
OSV 3.8

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.

Record
CVE-2026-53763
CVSS 3.0
3.8 LowCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
Weakness
CWE-190
Updated
2026-11-02
OSVDEBIAN-CVE-2026-53763 3.8

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.

Record
DEBIAN-CVE-2026-53763
CVSS 3.0
3.8 LowCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-53763 3.8

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.

Record
UBUNTU-CVE-2026-53763
CVSS 3.0
3.8 LowCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
optee-os
Debian:13
 All versions, plus listed versions
4.10.0-14.10.0-24.5.0-24.7.0-14.8.0-14.9.0-1
 None known
optee-os
Ubuntu:25.10
 All versions, plus listed versions
4.5.0-14.5.0-24.7.0-1
 None known
optee-os
Ubuntu:26.10
 All versions, plus listed versions
4.8.0-14.10.0-14.10.0-2
 None known
optee-os
Ubuntu:26.04:LTS
 All versions, plus listed versions
4.7.0-14.8.0-1
 None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-53763 is a low vulnerability (CVSS 3.8) in Trustedfirmware Op-tee, published July 6, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.19%, the 9th percentile. No source names a fixed version.

References

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