vulnerability
Red Hat: CVE-2025-38477: kernel: net/sched: sch_qfq: Fix race condition on qfq_aggregate (Multiple Advisories)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 6 | (AV:L/AC:L/Au:S/C:C/I:P/A:C) | Jul 28, 2025 | Jul 31, 2025 | Dec 24, 2025 |
Severity
6
CVSS
(AV:L/AC:L/Au:S/C:C/I:P/A:C)
Published
Jul 28, 2025
Added
Jul 31, 2025
Modified
Dec 24, 2025
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.
Solutions
no-fix-redhat-rpm-packageredhat-upgrade-kernel
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