Vsock Vulnerability in Linux Kernel Affects Socket Management
CVE-2025-40248

Currently unrated

Key Information:

Vendor: Linux
Status: Linux
Vendor: CVE Published:; 4 December 2025

What is CVE-2025-40248?

A vulnerability in the Linux kernel's vsock implementation can lead to improper management of established sockets during a connect operation. When a connect() call encounters a signal or timeout after a socket has already been established, it initiates disconnection processes that can interfere with ongoing data transmission, potentially raising application state inconsistencies. This race condition may lead to an elevation of unsent bytes, confusion in SOCK_LINGER management, and problematic interactions with sockmaps, ultimately risking use-after-free or null pointer dereferencing scenarios. Developers are advised to maintain disconnection logic solely for unconnected sockets to prevent these issues.

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