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CVE-2025-38350 is a use-after-free vulnerability in the Linux kernel net/sched traffic-control subsystem, affecting backlog accounting and class notification handling. Certain classful queueing disciplines can invoke a class dequeue handler during enqueue processing. This can unexpectedly empty a child qdisc, causing qlen_notify() to mark an in-flight class as passive. A qdisc may later reactivate the class and operate on a stale class pointer after the underlying object has been freed. The issue affects qdisc hierarchies such as those involving DRR, HFSC, netem, and blackhole disciplines.
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A Linux kernel net/sched use-after-free vulnerability involving classful queueing disciplines. Unexpected emptying of a child qdisc can leave an in-flight class passive; subsequent reactivation can dereference a stale class pointer.
A Linux kernel net/sched issue involving failure to consistently pass notifications when a child traffic-control class becomes empty.
A Linux kernel net/sched issue involving notification handling when a child traffic-control class becomes empty.
A Linux kernel net/sched issue fixed through the Red Hat kernel-rt security update.
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.