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CVE-2025-38477 is a race condition in the Linux kernel's Quick Fair Queueing (sch_qfq) network scheduler involving the qfq_aggregate object. When qfq_change_agg modifies an aggregate during qfq_enqueue, other threads can access it without adequate synchronization. Concurrent class operations can trigger a NULL-pointer dereference in qfq_dump_class or a use-after-free in qfq_delete_class. The fix moves qfq_destroy_class into the critical section and adds sch_tree_lock protection to qfq_dump_class and qfq_dump_class_stats.
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A race condition in the Linux kernel's QFQ network scheduler can cause a NULL pointer dereference in qfq_dump_class or a use-after-free in qfq_delete_class. The advisory identifies local availability impact and assigns a CVSS v3 score of 4.7. The fix moves qfq_destroy_class into the critical section and adds sch_tree_lock protection to qfq_dump_class and qfq_dump_class_stats.
A race condition in the Linux kernel's QFQ packet scheduler can cause a NULL pointer dereference or use-after-free. The advisory rates it medium severity, with a CVSS v3 score of 4.7, describing a local attack requiring low privileges and high attack complexity that can severely affect availability. The fix moves qfq_destroy_class into a critical section and adds sch_tree_lock protection to qfq_dump_class and qfq_dump_class_stats. The recommended remediation is to update the linux package and related packages to version 6.1.147-1 or later.
A race condition in the Linux kernel's QFQ packet scheduler can cause a NULL-pointer dereference or use-after-free during concurrent aggregate access. The advisory rates it CVSS v3 4.7, indicating local exploitation requiring low privileges and high attack complexity, with high availability impact. The fix moves qfq_destroy_class into a critical section and adds sch_tree_lock protection to class-dump operations.
A locally exploitable, high-complexity vulnerability requiring low privileges that can cause a complete availability impact, with no stated confidentiality or integrity impact.
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