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CVE-2025-38000 is a queue-length and backlog accounting vulnerability in the Linux kernel's Hierarchical Fair Service Curve (HFSC) traffic-control scheduler. When enqueuing the first packet to an HFSC class, hfsc_enqueue() invokes the child queue discipline's peek() operation before incrementing sch->q.qlen and sch->qstats.backlog. A child queue discipline using qdisc_peek_dequeued() may immediately dequeue or drop a packet, causing qdisc_tree_reduce_backlog() to operate before the parent accounting is updated. The resulting inconsistent accounting can leave an empty HFSC class on the active list and potentially lead to use-after-free.
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A queue-accounting flaw in the Linux kernel's HFSC scheduler can cause use-after-free. hfsc_enqueue() invokes the child queueing discipline's peek operation before updating queue length and backlog, allowing a dequeue or packet drop to produce inconsistent accounting. The fix updates these counters before invoking peek. The advisory assigns a CVSS v3 base score of 7.8 and recommends updating Echo linux packages to version 6.1.147-1 or later.
A Linux kernel HFSC (Hierarchical Fair Service Curve) queueing-discipline flaw caused by incorrect queue-length and backlog accounting during packet enqueue operations. Under relevant conditions it can result in an empty class persisting in the active list and potentially lead to use-after-free.
A locally exploitable vulnerability affecting Unity Linux systems, requiring low privileges and no user interaction, with high impact to confidentiality, integrity, and availability.
Linux kernel sch_hfsc queue-length accounting flaw when peek is used in hfsc_enqueue().
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Cross-references every affected SKU, including bundled OEM variants.
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