CVE-2025-38477

medium

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.

References

https://git.kernel.org/stable/c/fbe48f06e64134dfeafa89ad23387f66ebca3527

https://git.kernel.org/stable/c/c000a3a330d97f6c073ace5aa5faf94b9adb4b79

https://git.kernel.org/stable/c/a6d735100f602c830c16d69fb6d780eebd8c9ae1

https://git.kernel.org/stable/c/5e28d5a3f774f118896aec17a3a20a9c5c9dfc64

https://git.kernel.org/stable/c/466e10194ab81caa2ee6a332d33ba16bcceeeba6

Details

Source: Mitre, NVD

Published: 2025-07-28

Updated: 2025-07-29

Risk Information

CVSS v2

Base Score: 6.9

Vector: CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C

Severity: Medium

CVSS v3

Base Score: 6.3

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H

Severity: Medium

EPSS

EPSS: 0.00018