What is CVE-2026-40290?

CVE-2026-40290 is a high-severity vulnerability in Linaro Op-tee, classified under Use After Free. CVSS score: 7.8/10. Published 2026-06-03.

How severe is CVE-2026-40290?

High severity. CVSS v3 base score is 7.8 out of 10.

Use After Free in Linaro Op-tee

CVE-2026-40290

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…

Vulnerability class: Use-After-Free

EPSS: 0.000 (2.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linaro Op-tee
Op-tee Optee_os — versions >= 3.16.0, < 4.11.0
Trustedfirmware Op-tee

Weakness classification (CWE)

CWE-416 — Use After Free

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-40290?: CVE-2026-40290 is a high-severity vulnerability in Linaro Op-tee, classified under Use After Free. CVSS score: 7.8/10. Published 2026-06-03.
How severe is CVE-2026-40290?: High severity. CVSS v3 base score is 7.8 out of 10.