CVE-2026-40290: 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-2026-40290?

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

Q: Is CVE-2026-40290 being exploited?

CVE-2026-40290 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-2026-40290 affect?

CVE-2026-40290 affects op-tee. Severity is high (CVSS 7.8). 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 3.16.0 and prior to 4.11.0, a user-after-free (UAF) race c

Q: How urgent is CVE-2026-40290?

Priority 39/100. High severity; Public exploit reference; On your watchlist

Routine

HIGH 7.8WATCHLISTUPGRADE

CVE-2026-40290 is a high-severity flaw (CVSS 7.8) 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 3.16.0 and prior to 4.11.0, a user-after-free (UAF) race condition exists in the shared memory teardown logic of FF-A within OP-TEE SPMC/SP flows. This only applies when OP-TEE is configured as an SPMC for S-EL0 SPs, that is, with `CFG_SECURE_PARTITION=y`. The functi

Why this priority

High severity
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-416
Published	2026-06-03
Last modified	2026-07-21

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

Last updated 2026-07-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-03 18:16 UTCPublished CVE record published
2026-07-21 19:10 UTCUpdated Record last modified

trustedfirmware op-tee UPGRADE

Affected: >= 3.16.0 and <= 4.10.0

Fixed in: newer than 4.10.0

Safe to downgrade to: a release before 3.16.0

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-2026-40290?

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

Is CVE-2026-40290 being exploited?

CVE-2026-40290 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-2026-40290 affect?

CVE-2026-40290 affects op-tee. Severity is high (CVSS 7.8). 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 3.16.0 and prior to 4.11.0, a user-after-free (UAF) race c

How urgent is CVE-2026-40290?

Priority 39/100. High severity; Public exploit reference; On your watchlist

Software pages

Linux kernel vulnerabilities

Related CVEs

CVE-2026-33662 HIGH 7.5 UPGRADE OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on
CVE-2026-33317 HIGH 8.7 UPGRADE OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on
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-2026-53763 LOW 3.8 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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