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.
Published: 2025-07-28
Score: 4.7 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4327-1 linux security update
Debian DLA Debian DLA DLA-4328-1 linux-6.1 security update
Debian DSA Debian DSA DSA-5973-1 linux security update
Debian DSA Debian DSA DSA-5975-1 linux security update
EUVD EUVD EUVD-2025-22885 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.
Ubuntu USN Ubuntu USN USN-7791-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7792-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7793-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7795-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7796-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7791-2 Linux kernel (Real-time) vulnerabilities
Ubuntu USN Ubuntu USN USN-7798-1 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-7792-2 Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN Ubuntu USN USN-7799-1 Linux kernel (Real-time) vulnerabilities
Ubuntu USN Ubuntu USN USN-7800-1 Linux kernel (Raspberry Pi Real-time) vulnerabilities
Ubuntu USN Ubuntu USN USN-7793-2 Linux kernel (Oracle) vulnerabilities
Ubuntu USN Ubuntu USN USN-7793-3 Linux kernel (FIPS) vulnerabilities
Ubuntu USN Ubuntu USN USN-7793-4 Linux kernel (Real-time) vulnerabilities
Ubuntu USN Ubuntu USN USN-7801-1 Linux kernel (HWE) vulnerabilities
Ubuntu USN Ubuntu USN USN-7795-2 Linux kernel (FIPS) vulnerabilities
Ubuntu USN Ubuntu USN USN-7796-2 Linux kernel (FIPS) vulnerabilities
Ubuntu USN Ubuntu USN USN-7796-3 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-7791-3 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7801-2 Linux kernel (Oracle) vulnerabilities
Ubuntu USN Ubuntu USN USN-7792-3 Linux kernel (AWS) vulnerabilities
Ubuntu USN Ubuntu USN USN-7808-1 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-7809-1 Linux kernel (Azure, N-Series) vulnerabilities
Ubuntu USN Ubuntu USN USN-7793-5 Linux kernel (GKE) vulnerabilities
Ubuntu USN Ubuntu USN USN-7810-1 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-7811-1 Linux kernel (NVIDIA Tegra IGX) vulnerabilities
Ubuntu USN Ubuntu USN USN-7795-3 Linux kernel (AWS FIPS) vulnerabilities
Ubuntu USN Ubuntu USN USN-7819-1 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-7796-4 Linux kernel (Azure FIPS) kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7820-1 Linux kernel (Oracle) vulnerabilities
Ubuntu USN Ubuntu USN USN-7791-4 Linux kernel (Oracle) vulnerabilities
Ubuntu USN Ubuntu USN USN-7821-1 Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN Ubuntu USN USN-7808-2 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-7810-2 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-7810-3 Linux kernel (Azure FIPS) vulnerabilities
Ubuntu USN Ubuntu USN USN-7801-3 Linux kernel (Oracle) vulnerabilities
Ubuntu USN Ubuntu USN USN-7819-2 Linux kernel (Azure FIPS) vulnerabilities
Ubuntu USN Ubuntu USN USN-7795-4 Linux kernel (Oracle) vulnerabilities
Ubuntu USN Ubuntu USN USN-7854-1 Linux kernel (KVM) vulnerabilities
Ubuntu USN Ubuntu USN USN-7795-5 Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN Ubuntu USN USN-7875-1 Linux kernel (Oracle) vulnerabilities
Ubuntu USN Ubuntu USN USN-7933-1 Linux kernel (KVM) vulnerabilities
History

Tue, 12 May 2026 13:30:00 +0000

Type Values Removed Values Added
References

Tue, 23 Dec 2025 18:30:00 +0000

Type Values Removed Values Added
First Time appeared Debian
Debian debian Linux
Weaknesses CWE-362
CPEs cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:*
Vendors & Products Debian
Debian debian Linux
Metrics cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV3_1

{'score': 4.7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'}


Mon, 03 Nov 2025 18:30:00 +0000


Thu, 28 Aug 2025 14:45:00 +0000


Tue, 29 Jul 2025 12:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Important


Tue, 29 Jul 2025 08:00:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Mon, 28 Jul 2025 11:30:00 +0000

Type Values Removed Values Added
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.
Title net/sched: sch_qfq: Fix race condition on qfq_aggregate
References

Subscriptions

Debian Debian Linux
Linux Linux Kernel
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-05-12T12:05:08.048Z

Reserved: 2025-04-16T04:51:24.021Z

Link: CVE-2025-38477

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2025-07-28T12:15:29.617

Modified: 2026-05-12T13:16:51.007

Link: CVE-2025-38477

cve-icon Redhat

Severity : Important

Publid Date: 2025-07-28T00:00:00Z

Links: CVE-2025-38477 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-07-29T07:59:22Z

Weaknesses