CVE-2026-45702: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in OP-TEE optee_os
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.
AI Analysis
Technical Summary
OP-TEE OS, a Trusted Execution Environment for Arm Cortex-A cores using TrustZone, has a type confusion vulnerability (CWE-843) identified as CVE-2026-45702. This vulnerability affects versions starting at 4.3.0 and prior to 4.11.0 when OP-TEE is configured with CFG_CORE_SEL1_SPMC=y and CFG_SECURE_PARTITION=y, enabling it as an SPMC for S-EL0 secure partitions. The flaw occurs during handling of FFA_MEM_SHARE requests from the normal world, potentially leading to a denial of service (availability impact). The vulnerability is resolved in version 4.11.0.
Potential Impact
The vulnerability does not impact confidentiality or integrity but can cause denial of service (availability impact) due to type confusion when processing specific memory share requests. Exploitation requires local privileges (AV:L) and high privileges (PR:H) with no user interaction needed. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade OP-TEE OS to version 4.11.0 or later, where this vulnerability is fixed. Patch status is confirmed by the version range and fix version stated. No other mitigation or temporary fixes are indicated.
CVE-2026-45702: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in OP-TEE optee_os
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 v3.1
Score 4.4medium
Affected software
pkg:github/op-tee/optee_osRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
OP-TEE OS, a Trusted Execution Environment for Arm Cortex-A cores using TrustZone, has a type confusion vulnerability (CWE-843) identified as CVE-2026-45702. This vulnerability affects versions starting at 4.3.0 and prior to 4.11.0 when OP-TEE is configured with CFG_CORE_SEL1_SPMC=y and CFG_SECURE_PARTITION=y, enabling it as an SPMC for S-EL0 secure partitions. The flaw occurs during handling of FFA_MEM_SHARE requests from the normal world, potentially leading to a denial of service (availability impact). The vulnerability is resolved in version 4.11.0.
Potential Impact
The vulnerability does not impact confidentiality or integrity but can cause denial of service (availability impact) due to type confusion when processing specific memory share requests. Exploitation requires local privileges (AV:L) and high privileges (PR:H) with no user interaction needed. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade OP-TEE OS to version 4.11.0 or later, where this vulnerability is fixed. Patch status is confirmed by the version range and fix version stated. No other mitigation or temporary fixes are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-13T04:38:01.165Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a207a8be29bf47b50dc5169
Added to database: 06/03/2026, 19:03:39 UTC
Last enriched: 06/10/2026, 19:37:26 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 47
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