Vulnerability · Published Jun 3, 2026 · Assigned by GitHub_M

CVE-2026-45702OP-TEE has FF-A type confusion in SPMC tmem path that causes S-EL1 kernel panic

Medium 4.4

In plain English

A medium-severity type confusion in optee_os from OP-TEE. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).

Severity (CVSS 3.1)4.4Medium

Exploit odds (30 days)0.2%top 95.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 4.3.0 and prior to version 4.11.0, a type confusion vulnerability exists in OP-TEE OS when processing an FFA_MEM_SHARE request from the normal world. This only applies when OP-TEE is configured as an SPMC for S-EL0 SPs, that is, with `CFG_CORE_SEL1_SPMC=y` and `CFG_SECURE_PARTITION=y`. Version 4.11.0 fixes the issue.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	optee-os	no fix listed	DEBIAN-CVE-2026-45702
Ubuntu:25.10	optee-os	no fix listed	UBUNTU-CVE-2026-45702
Ubuntu:26.04:LTS	optee-os	no fix listed	UBUNTU-CVE-2026-45702
Ubuntu:26.10	optee-os	no fix listed	UBUNTU-CVE-2026-45702

Affected products (as reported)

Vendor	Product	Versions
OP-TEE	optee_os	>= 4.3.0, < 4.11.0

Weakness: CWE-843 · Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

References

https://github.com/OP-TEE/optee_os/security/advisories/GHSA-86pj-8xgw-66p5 x_refsource_CONFIRM