CVE-2023-52878 in Linux
Summary
by MITRE • 05/21/2024
In the Linux kernel, the following vulnerability has been resolved:
can: dev: can_put_echo_skb(): don't crash kernel if can_priv::echo_skb is accessed out of bounds
If the "struct can_priv::echoo_skb" is accessed out of bounds, this would cause a kernel crash. Instead, issue a meaningful warning message and return with an error.
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Analysis
by VulDB Data Team • 04/30/2025
The vulnerability identified as CVE-2023-52878 resides within the Linux kernel's CAN (Controller Area Network) subsystem, specifically affecting the can_put_echo_skb() function responsible for handling echo skb (socket buffer) operations. This flaw represents a classic buffer overread condition that could lead to system instability and potential denial of service scenarios. The CAN subsystem is critical for automotive and industrial communication protocols where real-time data transmission is essential for system operation.
The technical implementation flaw occurs when the can_priv::echo_skb array is accessed beyond its allocated boundaries during the processing of CAN frames. This out-of-bounds access pattern typically arises from improper bounds checking within the kernel's CAN driver implementation, where the echo_skb structure is manipulated without adequate validation of array indices or buffer limits. The vulnerability manifests as a kernel crash rather than graceful error handling, indicating a lack of proper input validation and boundary checking mechanisms in the affected code path.
From an operational impact perspective, this vulnerability presents a significant risk to systems relying on CAN communication, particularly in automotive environments where kernel stability directly affects vehicle operation and safety. The crash condition could lead to complete system shutdowns or unresponsive states, potentially causing dangerous situations in automotive applications where CAN bus communication is critical for engine control, braking systems, or other safety-critical functions. The vulnerability affects systems running Linux kernels that include the affected CAN driver components.
The mitigation strategy involves implementing proper bounds checking mechanisms within the can_put_echo_skb() function to prevent out-of-bounds memory access. The fix requires modifying the code to validate array indices before accessing the echo_skb structure and implementing proper error handling that issues warning messages rather than allowing kernel crashes. This approach aligns with CWE-129 Input Validation and CWE-787 Out-of-bounds Write principles, ensuring that memory operations remain within allocated boundaries. The solution follows established kernel security practices recommended in the Linux kernel security documentation and aligns with ATT&CK technique T1499.004 for system disruption through kernel-level attacks.
This vulnerability demonstrates the critical importance of memory safety in kernel space operations where improper bounds checking can lead to complete system compromise. The fix represents a defensive programming approach that prioritizes system stability over potential performance optimizations, ensuring that kernel subsystems maintain robust error handling capabilities. The resolution addresses fundamental security principles that prevent privilege escalation and system instability through memory corruption vulnerabilities.