CVE-2026-42546
LowCVSS 3.8Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
In OP-TEE from version 3.3.0 to 4.10.0, a resource leak exists in the `cleanup_shm_refs()` function due to missing bitmask application on parameter attributes. This skips the `mobj_put()` call for non-contiguous memory parameters, causing a persistent leak of `mobj_reg_shm` objects and exhaustion of the secure-world heap.
Risk Assessment
The organization faces progressive degradation of trusted application performance and eventual system reboot requirements to recover resources, potentially disrupting critical TEE-based services.
Recommendation
Upgrade OP-TEE to version 4.11.0 or later immediately, as it contains the fix. No workarounds are available.
Original NVD description (English source)
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.