Netfilter Vulnerability in Linux Kernel Affecting Network Namespaces

CVE-2026-31496

What is CVE-2026-31496?

In the Linux kernel, a vulnerability related to netfilter has been addressed, allowing for the potential bypassing of connection tracking expectations across different network namespaces. This issue enables the skipping of expectations that do not belong to the current network namespace, leading to the possibility of unauthorized access or manipulation of connection tracking data. The vulnerability has been mitigated through a series of updates ensuring that expectations in other namespaces are no longer processed via the proc filesystem, enhancing the overall security of the kernel's networking subsystem.

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