CVE-2026-58701 in Google
Summary
by MITRE • 09/15/2026
In trusty_dputc of generic-arm64-smcall.c, there is a possible out-of-bounds write due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability identified in the trusty_dputc function within generic-arm64-smcall.c represents a critical security flaw rooted in improper synchronization mechanisms during inter-processor communication on ARM64 architectures utilizing TrustZone technology. This specific race condition arises when multiple execution contexts attempt to write data to a shared buffer or control structure without adequate locking or atomic operations, leading to an out-of-bounds write scenario. The core technical issue lies in the lack of mutual exclusion around critical sections where pointer arithmetic and memory allocation are performed concurrently by different threads or interrupt handlers. When this race condition is successfully triggered, one execution context may overwrite memory locations adjacent to the intended buffer boundary, potentially corrupting kernel data structures, overwriting return addresses on the stack, or modifying function pointers in nearby objects. This corruption allows an attacker who has already achieved local code execution privileges to escalate their access level to that of the system administrator or root user, thereby gaining full control over the operating system and all its resources.
From a threat modeling perspective, this vulnerability aligns with CWE-362, which describes concurrent execution using shared resources with improper synchronization, leading to race conditions. The specific manifestation as an out-of-bounds write further correlates with CWE-787, indicating that the flaw allows writing data outside of allocated memory boundaries. In terms of attack vectors and tactics, this vulnerability facilitates privilege escalation attacks categorized under MITRE ATT&CK technique T1068, which involves exploitation for privilege escalation. The requirement for system execution privileges to exploit suggests that an attacker must first compromise a lower-privileged process or service within the trusted execution environment or the normal world OS before they can trigger this race condition. However, once local code execution is achieved, the absence of user interaction makes automated exploitation feasible and highly dangerous in multi-user environments such as mobile devices running Android with Trusty TEE integration or embedded systems relying on ARM Secure Monitor calls for hardware abstraction.
The operational impact of this vulnerability extends beyond simple privilege escalation to include potential denial of service through kernel panic caused by memory corruption, as well as the compromise of sensitive data processed within the secure world if the attacker can manipulate security-critical structures like access control lists or cryptographic key storage pointers. Mitigation strategies must focus on enforcing strict synchronization primitives around all shared resource accesses in generic-arm64-smcall.c. This includes implementing spinlocks or mutexes to ensure atomicity during buffer operations, validating input bounds rigorously before any write operation occurs, and utilizing compiler-based protections such as stack canaries and address space layout randomization where applicable. Additionally, code review processes should prioritize identifying race conditions in low-level system calls that interface with hardware abstraction layers, ensuring that all concurrent access paths are properly serialized to prevent memory corruption vulnerabilities from being exploitable by local attackers.