CVE-2025-38477 Information

Jul 29, 2025 cve

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.

Reference

https://git.kernel.org/stable/c/466e10194ab81caa2ee6a332d33ba16bcceeeba6 https://git.kernel.org/stable/c/5e28d5a3f774f118896aec17a3a20a9c5c9dfc64 https://git.kernel.org/stable/c/a6d735100f602c830c16d69fb6d780eebd8c9ae1 https://git.kernel.org/stable/c/c000a3a330d97f6c073ace5aa5faf94b9adb4b79 https://git.kernel.org/stable/c/fbe48f06e64134dfeafa89ad23387f66ebca3527

CNNVD-202507-3443 (Published: 2025-07-28)

Share on: