CVE-2026-53763: OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on

Q: How do I fix CVE-2026-53763?

op-tee: upgrade to newer than 4.10.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-53763 being exploited?

CVE-2026-53763 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-53763 affect?

CVE-2026-53763 affects op-tee. Severity is low (CVSS 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 overflow

Q: How urgent is CVE-2026-53763?

Priority 21/100. On your watchlist

Routine

LOW 3.8WATCHLISTUPGRADE

CVE-2026-53763 is a low-severity flaw (CVSS 3.8) affecting op-tee. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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).

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	3.8 (Low)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-190
Published	2026-07-06
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: trustedfirmware

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-06 20:16 UTCPublished CVE record published
2026-10-25 20:10 UTCUpdated Record last modified

trustedfirmware op-tee UPGRADE

Affected: >= 3.0.0 and <= 4.10.0

Fixed in: newer than 4.10.0

Safe to downgrade to: a release before 3.0.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-53763?

op-tee: upgrade to newer than 4.10.0. Exact commands for each OS are on this page.

Is CVE-2026-53763 being exploited?

CVE-2026-53763 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-53763 affect?

CVE-2026-53763 affects op-tee. Severity is low (CVSS 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 overflow

How urgent is CVE-2026-53763?

Priority 21/100. On your watchlist

Software pages

Linux kernel vulnerabilities

Related CVEs

CVE-2026-44362 MEDIUM 5.5 UPGRADE OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on
CVE-2026-40257 MEDIUM 5.5 UPGRADE OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on
CVE-2026-41516 LOW 2.5 UPGRADE OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on
CVE-2026-42546 LOW 3.8 UPGRADE OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on
CVE-2026-41434 LOW 3.3 UPGRADE OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on

References

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