Bug 2497449 (CVE-2026-42546)

Summary: CVE-2026-42546 OP-TEE: OP-TEE: Denial of Service due to resource leak in shared memory cleanup
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in OP-TEE, a Trusted Execution Environment (TEE) for Arm Cortex-A cores. A resource leak exists in the shared memory cleanup logic where the system fails to properly release memory objects when processing non-contiguous memory parameters from a normal-world caller. Over time, these accumulated leaks consume the secure-world heap, leading to a degradation of trusted application operations and eventually requiring a system reboot. This can result in a Denial of Service (DoS).
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Bug Depends On: 2497693    
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Description OSIDB Bzimport 2026-07-06 20:01:33 UTC 
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.