CVE WatchJul 30, 2026

CVE-2025-38477

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix race condition on qfq_aggregate A race conditi

CVSS

7.8

High

EPSS

0.1%

KEV

—

Exploit Today

0-100

Published: Jul 28, 2025 · Last modified: Jul 30, 2026 · CWE-362

EPSS · 30d

0.1%EPSS · 30 days0.1%

2026-09-282026-10-25

Technical description

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix race condition on qfq_aggregate A race condition can occur when 'agg' is modified in qfq_change_agg (called during qfq_enqueue) while other threads access it concurrently. For example, qfq_dump_class may trigger a NULL dereference, and qfq_delete_class may cause a use-after-free. This patch addresses the issue by: 1. Moved qfq_destroy_class into the critical section. 2. Added sch_tree_lock protection to qfq_dump_class and qfq_dump_class_stats.

Official references

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