CVE-2026-58734 in Android
Summary
by MITRE • 09/15/2026
In google_mba_recv_msg of google_mba_poll.c, there is a possible out-of-bounds write due to a race condition. This could lead to local escalation of privilege with no additional 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 Google MBA driver, specifically within the google_mba_recv_msg function located in google_mba_poll.c, represents a critical security flaw stemming from improper synchronization mechanisms during message processing operations. This race condition arises when multiple threads or execution contexts attempt to access and modify shared data structures concurrently without adequate locking or atomicity guarantees. In this specific context, the driver handles communication between user space applications and hardware components related to Mobile Broadband Adapter functionality. The lack of proper mutual exclusion allows a window where one thread may read a pointer or index value while another thread modifies it, leading to inconsistent state management within the kernel memory structures.
The technical core of this vulnerability is an out-of-bounds write operation that occurs due to these unsynchronized accesses. When the race condition is triggered, the driver may calculate incorrect buffer offsets or array indices based on stale data. Consequently, subsequent write operations target memory locations outside the allocated boundaries of the intended buffers. This type of flaw falls squarely under CWE-362, which classifies concurrent execution using shared resources with improper synchronization as a root cause for race conditions leading to security vulnerabilities. The out-of-bounds nature of the write is particularly dangerous because it allows an attacker to overwrite adjacent memory structures that are not part of the original allocation scope.
The operational impact of this vulnerability is severe, primarily due to its potential for local privilege escalation. Since the flaw exists within a kernel-space driver component, successful exploitation grants the attacker arbitrary read and write capabilities in ring 0, which corresponds to the highest level of system access on most operating systems. The description notes that no additional execution privileges are required beyond those typically granted to users interacting with the device interface, nor does it require user interaction for exploitation once the vulnerability is triggered. This significantly lowers the barrier for attack, allowing any local unprivileged user to potentially compromise the integrity and confidentiality of the entire system by overwriting critical kernel data structures such as function pointers or security tokens.
From a threat modeling perspective aligned with MITRE ATT&CK frameworks, this vulnerability facilitates techniques associated with privilege escalation on Linux systems, specifically those involving driver exploitation and memory corruption. Attackers can leverage the out-of-bounds write to manipulate control flow within the kernel, potentially executing arbitrary code with root privileges or bypassing security mechanisms like SELinux or AppArmor by modifying their configuration data in memory. The absence of user interaction requirements means that automated tools could theoretically exploit this flaw across multiple local accounts without social engineering components, making it a high-risk issue for multi-user environments and servers where various services run under different user identities.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements. The primary remediation involves updating the google_mba driver to versions that implement proper locking mechanisms around all shared data accesses within the recv_msg function. Developers should utilize spinlocks or mutexes to ensure atomicity of read-modify-write sequences, thereby eliminating the race window entirely. Additionally, implementing bounds checking and validating buffer indices before any memory access operations can provide defense-in-depth against similar logic errors. For system administrators unable to immediately patch, restricting device node permissions via udev rules to only trusted users or disabling the driver if not strictly necessary reduces the attack surface by limiting who can trigger the vulnerable code path.