network namespaces

About this tag
Network namespaces are a Linux kernel feature that isolates network stacks, including interfaces, routing tables, and firewall rules, within separate instances. On WindowsForum.com, discussions about network namespaces often arise in the context of Linux kernel security vulnerabilities that affect container platforms, WSL-adjacent lab systems, routers, and mixed Windows/Linux infrastructure. Recent threads cover CVEs such as CVE-2026-45845, a TAPRIO NULL pointer dereference that can be triggered locally; CVE-2026-31496, a netfilter conntrack expectations namespace leak fixed by filtering procfs dumps per namespace; and CVE-2025-40355, a sysfs ownership bug during network namespace moves. These topics highlight how namespace boundaries are critical for security and stability in Linux networking.

  1. CVE-2026-45845: TAPRIO NULL Pointer Dereference Kernel Panic (Local DoS)

    Linux kernel maintainers assigned CVE-2026-45845 on May 27, 2026, to a TAPRIO traffic-control flaw that can let a local user crash affected systems through a NULL pointer dereference in the class-dump path. The bug is not a remote network break-in, and it is not a privilege-escalation story on...
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    • kernel null dereference linux kernel security network namespaces taprio traffic control
    • Replies: 0
    • Forum: Security Alerts

  2. CVE-2026-31496: Linux Netfilter Conntrack Expectations Procfs Namespace Leak Fix

    CVE-2026-31496 is a narrowly scoped Linux kernel vulnerability, but it sits in one of the kernel’s most security-sensitive corners: netfilter and conntrack expectations. The newly published record says the bug was resolved by skipping expectation entries that do not belong to the current network...
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    • information disclosure linux kernel netfilter conntrack network namespaces
    • Replies: 0
    • Forum: Security Alerts

  3. CVE-2025-40355: Linux Sysfs Ownership Bug in Network Namespace Moves

    A newly assigned CVE has landed for the Linux kernel that zeroes in on a subtle sysfs ownership-check logic bug: CVE-2025-40355 addresses a condition where the kernel may attempt to change ownership of a sysfs group attribute that is not visible, triggering kernel WARN_ON traces and possible...
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    • linux kernel network namespaces sysfs vulnerability
    • Replies: 0
    • Forum: Security Alerts