CVE-2026-42546

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.

CVSS v3 3.8 LOW

3.8^/10

CVSS v3 : LOW

Vector :

Exploitability : 2.0 / Impact : 1.4

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope CHANGED

References

Link	Resource
https://github.com/OP-TEE/optee_os/security/advisories/GHSA-c7j8-fgqw-rcgp	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:o:trustedfirmware:op-tee:*:*:*:*:*:*:*:*

History

07 Jul 2026, 18:56

Type	Values Removed	Values Added
First Time		Trustedfirmware op-tee Trustedfirmware
CPE		cpe:2.3:o:trustedfirmware:op-tee::::::::
References	~~() https://github.com/OP-TEE/optee_os/security/advisories/GHSA-c7j8-fgqw-rcgp -~~	() https://github.com/OP-TEE/optee_os/security/advisories/GHSA-c7j8-fgqw-rcgp - Vendor Advisory

06 Jul 2026, 20:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-06 20:16

Updated : 2026-07-07 18:56

NVD link : CVE-2026-42546

Mitre link : CVE-2026-42546

CVE.ORG link : CVE-2026-42546

JSON object : View

Products Affected

trustedfirmware

op-tee

CWE

CWE-770

Allocation of Resources Without Limits or Throttling

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