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CVE-2025-71066 is a use-after-free vulnerability in the Linux kernel Enhanced Transmission Selection (ETS) traffic scheduler. A race between ets_qdisc_change and ets_qdisc_dequeue allows an ETS class to remain on the active list while its associated struct Qdisc object is freed. The change handler releases the queue-discipline tree lock before completing cleanup, allowing concurrent dequeue processing to access the freed object before its pointer is cleared. Exploitation requires the ability to create new user and network namespaces and may provide instruction-pointer control.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
23 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel net/sched ETS issue addressed by a Rocky Linux 9 security update.
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.
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.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.