Linux Kernel Vulnerability in rtmutex Component Affecting Multiple Versions

CVE-2026-43499

What is CVE-2026-43499?

CVE-2026-43499 is a vulnerability within the Linux kernel, specifically affecting the rtmutex component, which is responsible for managing real-time mutex locks. This vulnerability arises from improper handling of waiter tasks during the queue operation of real-time locks, where the function remove_waiter() uses the current task instead of the intended waiter task. As a result, this flaw can lead to several critical issues, including the mishandling of priority scheduling, potential memory corruption due to dangling pointers, and inconsistent state management for tasks. Such vulnerabilities can severely affect system stability and reliability, posing a risk for organizations that depend on Linux-based systems for essential operations.

Potential impact of CVE-2026-43499

1. Memory Corruption Risks: The vulnerability leads to dangling pointers which can result in use-after-free (UAF) vulnerabilities, potentially allowing unauthorized access to sensitive memory regions, and thereby increasing the attack surface for exploitation.

2. Priority Management Failures: The improper adjustment of task prioritization can result in a scenario where critical tasks do not execute as intended. This can significantly hinder system performance and responsiveness, especially within real-time applications that depend on timely execution.

3. Increased Attack Vector: The existence of this vulnerability allows threat actors to exploit weaknesses in task management, which could lead to further exploitation methods, including privilege escalation and denial of service, thereby compromising the overall security posture of affected systems.

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