CVE-2026-64041 in Linux
Summary
by MITRE • 07/19/2026
In the Linux kernel, the following vulnerability has been resolved:
ASoC: codecs: fs210x: fix possible buffer overflow
In fs210x_effect_scene_info(), a string was copied like this:
strscpy(DST, SRC, strlen(SRC) + 1);
A buffer overflow would happen if strlen(SRC) >= sizeof(DST). Actually, strscpy() must be used this way:
strscpy(DST, SRC, sizeof(DST)); strscpy(DST, SRC); // defaults to sizeof(DST)
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Analysis
by VulDB Data Team • 07/19/2026
The vulnerability in the Linux kernel's fs210x audio codec driver represents a critical buffer overflow condition that could potentially lead to system instability or arbitrary code execution. This flaw exists within the fs210x_effect_scene_info() function where string operations are improperly handled, creating an exploitable condition that violates fundamental memory safety principles. The issue stems from incorrect usage of the strscpy() function which is designed to prevent buffer overflows but was implemented with parameters that negate its protective capabilities.
The technical flaw occurs when the source string length exceeds the destination buffer capacity, specifically when strlen(SRC) reaches or surpasses sizeof(DST). This improper parameter usage transforms what should be a safe string copy operation into a dangerous buffer overflow scenario. The strscpy() function requires its third parameter to specify the maximum number of characters to copy including the null terminator, but in this case the implementation incorrectly passes strlen(SRC) + 1 instead of sizeof(DST). This error fundamentally undermines the security mechanism designed to prevent memory corruption and creates a pathway for potential exploitation.
The operational impact of this vulnerability extends beyond simple buffer overflow conditions as it affects the audio subsystem's reliability and system integrity. When exploited, this flaw could allow attackers to overwrite adjacent memory locations, potentially corrupting kernel data structures or executing malicious code with kernel privileges. The vulnerability specifically impacts systems using the fs210x codec driver in audio processing contexts, making it particularly concerning for embedded devices, mobile platforms, and any system where audio functionality is critical. This type of flaw aligns with CWE-121 which addresses stack-based buffer overflow conditions, and represents a classic example of improper input validation that could enable privilege escalation attacks.
Mitigation strategies for this vulnerability require immediate patching of affected kernel versions to correct the strscpy() parameter usage in the fs210x driver implementation. System administrators should prioritize updating their kernel components to versions containing the fix, which properly implements strscpy(DST, SRC, sizeof(DST)) or simply strscpy(DST, SRC) to default to safe buffer limits. Additionally, organizations should consider implementing runtime protections such as stack canaries and address space layout randomization to reduce exploitability even if patches are not immediately available. The fix aligns with ATT&CK technique T1068 by addressing privilege escalation vectors through kernel memory corruption prevention, and represents a standard defensive measure against buffer overflow exploitation patterns that have been documented across numerous security incidents in embedded systems and mobile platforms.
This vulnerability demonstrates the critical importance of proper string handling practices in kernel space programming where even seemingly minor implementation errors can create significant security risks. The fix emphasizes the necessity of following established security coding guidelines and proper use of kernel-provided safe string functions to prevent memory corruption vulnerabilities that could compromise entire system architectures.