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CVE-2026-42546— OP-TEE has missing OPTEE_MSG_ATTR_TYPE_MASK in cleanup_shm_refs() leaks mobj references

Quick assessment

Affected
OP-TEE optee_os
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OP-TEE optee_os是OP-TEE的安全操作系统。 OP-TEE optee_os 3.3.0版本至4.11.0之前版本存在资源管理错误漏洞，该漏洞源于共享内存清理逻辑中存在资源泄漏，因为函数cleanup_shm_refs()未能对参数属性应用所需的位掩码，导致mobj_reg_shm对象持久引用泄漏，逐渐消耗安全世界堆空间，最终需要重启恢复。

CVSS 3.8 · Low EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
OP-TEE optee_os >= 3.3.0, < 4.11.0 affected
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I. Basic Information for CVE-2026-42546

Vulnerability Information
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Vulnerability Title
OP-TEE has missing OPTEE_MSG_ATTR_TYPE_MASK in cleanup_shm_refs() leaks mobj references
Source: CVE Program / CVE List V5
Vulnerability 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 3.3.0 and prior to version 4.11.0, a resource leak exists in OP-TEE’s shared memory cleanup logic because the function `cleanup_shm_refs()` in `core/tee/entry_std.c` fails to apply a required bitmask (`OPTEE_MSG_ATTR_TYPE_MASK`) to parameter attributes. When processing non-contiguous memory parameters from a normal-world caller, the system fails to match the attribute type in its internal switch statement and skips the necessary mobj_put() call. This results in a persistent reference leak of `mobj_reg_shm` objects, which remain on internal lists with dangling refcounts. This affects non-FF-A configurations that support non-contiguous, non-secure shared memory. Over time, these accumulated leaks progressively consume the secure-world heap, degrading the system's ability to service trusted application operations and eventually requiring a reboot to recover. Version 4.11.0 contains a patch. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
OP-TEE optee_os 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OP-TEE optee_os是OP-TEE的安全操作系统。 OP-TEE optee_os 3.3.0版本至4.11.0之前版本存在资源管理错误漏洞，该漏洞源于共享内存清理逻辑中存在资源泄漏，因为函数cleanup_shm_refs()未能对参数属性应用所需的位掩码，导致mobj_reg_shm对象持久引用泄漏，逐渐消耗安全世界堆空间，最终需要重启恢复。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OP-TEE optee_os >= 3.3.0, < 4.11.0 -

II. Public POCs for CVE-2026-42546

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III. Intelligence Information for CVE-2026-42546

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Vendor Advisories for CVE-2026-42546 (1)

Same Patch Batch · OP-TEE · 2026-07-06 · 8 CVEs total

CVE-2026-40257 5.5 MEDIUM OP-TEE has SHA-3 accelerated finalize heap overflow
CVE-2026-44362 5.5 MEDIUM OP-TEE's subkey rollback protection can be bypassed with older subkey versions
CVE-2026-41434 3.3 LOW OP-TEE has unbounded recursion in sanitize_client_object()
CVE-2026-41514 2.5 LOW OP-TEE: RSA-OAEP padding oracle in Hisilicon HPRE driver enables plaintext recovery
CVE-2026-41516 2.5 LOW OP-TEE: Hisilicon HPRE PKCS#1 v1.5 Decryption Padding Oracle
CVE-2026-41515 2.5 LOW OP-TEE: RSA-OAEP padding oracle in NXP CAAM driver enables plaintext recovery
CVE-2026-53763 OP-TEE has AES-GCM 32-bit integer overflow in length counters that breaks authentication g

IV. Related Vulnerabilities

Same product: optee_os
Same vendor: OP-TEE
Same weakness: CWE-770

V. Comments for CVE-2026-42546

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