Medium severity · published Jun 3, 2026
CVE-2026-45702
OP-TEE has FF-A type confusion in SPMC tmem path that causes S-EL1 kernel panic
5.5
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 5% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
optee_os · OP-TEE
>= 4.3.0, < 4.11.0 · source: vendor
OP
Op-tee · Trustedfirmware
4.3.0 through 4.10.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45702
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45702
Exploit
https://github.com/OP-TEE/optee_os/security/advisories/GHSA-86pj-8xgw-66p5
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