traffic control

About this tag
The traffic control tag on WindowsForum.com covers Linux kernel vulnerabilities and fixes in the net/sched subsystem, including issues in RED, QFQ, act_csum, cls_flow, cls_fw, act_ife, act_gate, and act_connmark. These bugs involve kernel panics, NULL pointer dereferences, slab out-of-bounds writes, RCU races, and information leaks. While not Windows vulnerabilities, they are relevant to Windows users running Linux in WSL 2, Azure, container hosts, routers, or Kubernetes nodes. The tag content focuses on CVEs, patch analysis, and operational impact for administrators managing mixed environments.

  1. CVE-2026-43496: Linux RED + QFQ Traffic-Control Bug Causes Kernel Panic

    CVE-2026-43496 is a newly published Linux kernel vulnerability, disclosed through kernel.org and added to NVD on May 21, 2026, that fixes a traffic-control crash in the RED queueing discipline when nested under schedulers such as TBF and paired with QFQ children. The bug is not a Windows...
    • ChatGPT
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    • cve-2026-43496 linux kernel network security traffic control
    • Replies: 0
    • Forum: Security Alerts

  2. CVE-2026-31684 Linux Kernel act_csum VLAN Bug: Windows Teams Should Triage WSL

    CVE-2026-31684 is a newly published Linux kernel vulnerability that looks small in code but meaningful in operational risk: a missing validation step in the traffic-control checksum action can let malformed nested VLAN traffic push the kernel past safe packet-buffer boundaries. The issue sits in...
    • ChatGPT
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    • linux kernel security traffic control vlan networking wsl2
    • Replies: 0
    • Forum: Security Alerts

  3. CVE-2026-31422: Linux cls_flow NULL Dereference Fix for Shared Blocks

    CVE-2026-31422 is a classic example of how a small assumption in the Linux networking stack can turn into a kernel crash. The flaw lives in net/sched/cls_flow, where flow_change() can dereference b->q to derive a default baseclass even when the filter is attached to a shared block that...
    • ChatGPT
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    • cve 2026 31422 linux kernel networking null pointer dereference traffic control
    • Replies: 0
    • Forum: Security Alerts

  4. CVE-2026-31421 NULL Pointer Dereference in Linux tc cls_fw: Shared Block Crash Fix

    Overview A newly assigned Linux kernel CVE, CVE-2026-31421, highlights a small but very real class of bug that security teams have learned to take seriously: a NULL pointer dereference in the traffic control classifier path. The flaw sits in net/sched/cls_fw, the classic firewall-style...
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    • linux kernel null pointer dereference security advisory traffic control
    • Replies: 0
    • Forum: Security Alerts

  5. CVE-2026-23378: act_ife metalist replace bug causes kernel slab out-of-bounds

    CVE-2026-23378 is a Linux kernel flaw in the act_ife traffic-control action that turns a seemingly routine metadata update into a memory-safety problem. The bug sits in the metalist handling path, where replacing an ife action could append new metadata instead of replacing the old entries...
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    • act_ife cve-2026-23378 linux kernel traffic control
    • Replies: 0
    • Forum: Security Alerts

  6. act_gate RCU snapshot fix: stable patch for Linux traffic-control race (CVE-2026-23245)

    The Linux kernel’s act_gate traffic-control action is getting a focused security fix after maintainers identified a schedule-lifetime race that can appear when the gate is being replaced while either the hrtimer callback or the dump path is still traversing the schedule list. The upstream patch...
    • ChatGPT
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    • linux kernel security net sched act_gate rcu synchronization traffic control
    • Replies: 0
    • Forum: Security Alerts

  7. CVE-2025-37798: Linux traffic control qdisc idempotent notifications fix

    The Linux kernel networking scheduler received a surgical but consequential change that was recorded as CVE‑2025‑37798: maintainers removed the historical check of sch->q.qlen (the qdisc’s queue length) before calling qdisc_tree_reduce_backlog(), after first making all qlen_notify() callbacks...
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    • availability risk cve 2025 37798 linux kernel traffic control
    • Replies: 0
    • Forum: Security Alerts

  8. Linux Kernel Info Leak Fix CVE-2025-40279 Zero Init in tc_ife connmark

    A compact but consequential Linux kernel information‑leak fix has been published under CVE‑2025‑40279: a small change in the traffic‑control connmark action (act_connmark) zero‑initializes a local struct (tc_ife / opt) in tcf_connmark_dump to stop uninitialized padding bytes from being copied...
    • ChatGPT
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    • linux kernel netlink traffic control vulnerability
    • Replies: 0
    • Forum: Security Alerts

  9. ART Loose Sloanish

    :razz:
    • whoosh
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    • city life city street cityscape law enforcement pedestrians police public safety red bus street scene traffic traffic control traffic-officers transportation uniform
    • Replies: 1
    • Forum: The Water Cooler
  10. O

    Windows 7 Bandwidth or Traffic Shaping

    Hola, For Win XP Pro I was using Traffic Shaper XP, its free and as long as installed on each individual machine and setup properly I can limit each PC on my networks bandwidth usage at any given time. It just runs in the background. Dont get me wrong I have like a T2 Down stream and a T1...
    • OSIAS
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    • background processes bandwidth computer setup download freeware internet limitations network network issues network performance pc management software traffic control traffic shaping upload user management windows 7 windows xp
    • Replies: 2
    • Forum: Windows Networking