Use-After-Free Vulnerability in Linux Kernel Affects TCP Socket Management

CVE-2026-98432

What is CVE-2026-98432?

CVE-2026-98432 is a use-after-free vulnerability found in the Linux kernel, specifically related to TCP socket management. This vulnerability arises from improper handling of network socket options, particularly during the transfer of ownership of these options between sibling sockets during SYN-ACK responses. In scenarios where a retransmitted SYN request is received by a different CPU, it remains possible for the relevant socket options to be accessed after they have been freed, leading to a potential misuse of memory that could be exploited.

The implications for organizations leveraging Linux in their server infrastructure are significant, as this vulnerability could allow an attacker to execute arbitrary code or cause unexpected behavior in network communications, undermining system integrity and data security. Given its critical role in managing network traffic, unresolved flaws in the kernel can expose systems to serious risks, including denial of service and unauthorized access.

Potential impact of CVE-2026-98432

1. Arbitrary Code Execution: The use-after-free condition can potentially allow an attacker to execute arbitrary code by manipulating the memory that is improperly accessed. This can lead to systemic compromise of affected servers where the kernel interfaces with network streams.

2. Denial of Service: If exploited, this vulnerability has the potential to disrupt the normal functionality of TCP connections, leading to service interruptions or crashes within networked applications. This can significantly impact an organization's operations, especially if they rely on continuous network availability.

3. Data Corruption or Leakage: Exploiting this vulnerability could facilitate unauthorized access to sensitive data being transmitted over TCP connections. This could lead to data breaches or the corruption of critical information, impacting both organizational integrity and compliance with data protection regulations.

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