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A vulnerability in the Linux kernel's net/sched subsystem related to the netem packet duplication feature has been resolved. The flaw caused packet loops when netem duplicated packets, potentially exhausting system stack or memory due to recursive duplication. The issue was due to improper handling of duplication state shared across concurrent enqueue paths. The fix involves marking packets with a depth field to prevent repeated duplication safely. This vulnerability affects multiple Linux kernel versions prior to 7.0.0-28.28~24.04.1 and related versions. A patch is available and should be applied via standard system updates requiring a reboot. No known exploits are reported in the wild. The severity is assessed as medium.

The Linux kernel vulnerability CVE-2026-63983 involves the net/sched subsystem's netem feature, which duplicates packets for network emulation. When netem duplicates a packet, it re-enqueues the copy at the root qdisc. If another netem instance is present, the copy can be duplicated again recursively, leading to packet loops that exhaust stack or memory. The original guard used a per-qdisc state variable that was unsafe under concurrency. The fix uses the skb tc_depth field to mark packets, incrementing it on duplication and skipping duplication if tc_depth is non-zero, ensuring safe operation regardless of tree topology or concurrency. Multiple Linux kernel versions prior to 7.0.0-28.28~24.04.1 and related builds are affected. The issue is fixed in updated kernel packages provided by Ubuntu and others. The vendor advisory confirms patch availability and recommends updating and rebooting systems.

Detailed information about In the Linux kernel, the following vulnerability has been resolved: net/sched: fix packet loop on netem when duplicate is on When net

In the Linux kernel, the following vulnerability has been resolved: net/sched: fix packet loop on netem when duplicate is on When netem duplicates a… (CVE-2026-63983) - Live Threat Intelligence - Threat Radar | OffSeq.com

In the Linux kernel, the following vulnerability has been resolved: net/sched: fix packet loop on netem when duplicate is on When netem duplicates a… (CVE-2026-63983)

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