Race Condition in Linux Kernel's Networking Subsystem - Affected Product by Linux Foundation

CVE-2026-68138

What is CVE-2026-68138?

CVE-2026-68138 is a vulnerability identified in the Linux kernel's networking subsystem. Specifically, this issue arises from a race condition in the management of the qdisc_rtab_list, which is used for queuing disciplines within the Linux networking stack. The vulnerability allows for data corruption when multiple processes concurrently modify the global linked list of rate tables without proper synchronization mechanisms. This can result in a use-after-free or double-free condition, leading to potential system instability and exploitability by malicious actors. The integrity of the system could be severely compromised, making it critical for organizations relying on Linux environments to address this vulnerability promptly.

Potential Impact of CVE-2026-68138

1. System Instability: The race condition can lead to undefined behavior during networking operations, resulting in crashes, misrouted traffic, or severe performance degradation, thus affecting network reliability for sensitive applications.

2. Security Risks: An exploit of this vulnerability may enable attackers to gain unauthorized control of system resources, leading to potential data breaches or unauthorized modifications to critical system components.

3. Widespread Exploitability: Since the corrupted object is shared system-wide within the Linux kernel and affects multiple processes simultaneously, the potential for exploitation spans across various applications and services running on Linux systems, increasing the attack surface for threat actors.

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