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CVE-2025-71066 is a Linux kernel vulnerability in the Enhanced Transmission Selection (ETS) queuing discipline within net/sched. The flaw is a race condition between ets_qdisc_change and ets_qdisc_dequeue that can result in a use-after-free of a struct Qdisc object. During ETS reconfiguration, the code could unlock the qdisc tree before fully cleaning up old classes. In the affected path, a class could remain linked on the active list while its associated qdisc was later released with qdisc_put() and its pointer cleared. A concurrent dequeue operation could then traverse the active list and dereference the freed qdisc, creating a kernel memory-safety violation. The fix ensures that a class is always removed from the active list before its associated qdisc is deleted and freed.
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A Linux kernel vulnerability in net/sched ETS where a class must be removed from the active list before deletion in ets_qdisc_change.
A Linux kernel vulnerability in net/sched ETS queue discipline handling where a class must be removed from the active list before deletion.
A Linux kernel use-after-free vulnerability caused by a race condition in the ETS qdisc scheduler between ets_qdisc_dequeue and ets_qdisc_change, where a class can remain on the active list after its associated qdisc is deleted and freed.
A Linux kernel vulnerability in net/sched/ets related to removing a class from the active list before deletion in ets_qdisc_change.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.