CVE-2023-21058 in Android
Summary
by MITRE • 03/24/2023
In lcsm_SendRrAcquiAssist of lcsm_bcm_assist.c, there is a possible out of bounds write due to a missing bounds check. This could lead to remote code execution with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-246169606References: N/A
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Analysis
by VulDB Data Team • 09/10/2025
The vulnerability identified as CVE-2023-21058 resides within the Android kernel's lcsm_bcm_assist.c source file, specifically in the lcsm_SendRrAcquiAssist function. This represents a critical security flaw that stems from inadequate input validation mechanisms. The issue manifests as a missing bounds check during memory operations, creating an exploitable condition that could potentially allow unauthorized code execution without requiring any additional privileges or user interaction. The vulnerability affects Android kernel versions and has been assigned the Android ID A-246169606, indicating its significance within the Android security ecosystem.
The technical nature of this flaw aligns with CWE-787, which describes out-of-bounds write vulnerabilities occurring when a program writes to memory beyond the boundaries of a buffer. In this case, the lcsm_SendRrAcquiAssist function fails to validate the size or range of data being processed before attempting to write to memory locations. This missing validation creates a pathway for malicious actors to manipulate memory structures and potentially overwrite critical system components. The vulnerability's remote exploitation capability means that attackers can trigger the flaw without physical access to the device, making it particularly dangerous in mobile environments where devices frequently connect to untrusted networks.
The operational impact of CVE-2023-21058 extends beyond simple data corruption, as it could enable complete system compromise through remote code execution. Since no user interaction is required for exploitation, attackers can leverage this vulnerability in automated attacks against vulnerable Android devices. The absence of privilege escalation requirements means that even basic user-level access could potentially lead to full system control. This vulnerability particularly affects mobile devices running Android kernel versions, creating widespread exposure across numerous devices and applications that depend on the affected kernel components for communication and system management functions.
Mitigation strategies for this vulnerability should focus on immediate patch deployment from device manufacturers and Google, as well as implementing network-level protections to monitor for suspicious traffic patterns. Organizations should prioritize updating all affected Android devices to versions containing the patched kernel code, while also considering network segmentation and intrusion detection systems to identify potential exploitation attempts. The ATT&CK framework would categorize this vulnerability under T1059 for remote code execution techniques, with potential use of T1068 for privilege escalation. Security teams should implement comprehensive monitoring of kernel-level memory operations and establish incident response procedures specifically addressing kernel-level vulnerabilities that could lead to full system compromise.