CVE-2025-38477

Aliases:UBUNTU-CVE-2025-38477DEBIAN-CVE-2025-38477
Advisory lineage Upstream: 0 Downstream: 164
Modified
Published: 28 Jul 2025, 11:21
Last modified:05 Aug 2026, 12:02

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (cve.org)
EPSS Score
0.12% LOW
0% probability +0.11%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

28 Jul 2025, 11:21
Published
Vulnerability first disclosed
05 Aug 2026, 12:02
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.12%• Percentile: 2%

Techniques & Countermeasures

  • CWE-362•Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

    The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Affected Systems

  • debian•linux

    < 5.10.244-1 | < 6.1.147-1 | < 6.12.41-1 | < 6.16.3-1

  • debian•linux-6.1

    < 6.1.153-1~deb11u1

  • ubuntu•linux

    all | < 4.15.0-242.254 | < 5.4.0-222.242 | < 5.15.0-157.167 | < 6.8.0-85.85

  • ubuntu•linux-allwinner-5.19

    all

  • ubuntu•linux-aws

    all | < 4.15.0-1185.198 | < 5.4.0-1151.161 | < 5.15.0-1093.100 | < 6.8.0-1040.42

  • ubuntu•linux-aws-5.0

    all

  • ubuntu•linux-aws-5.11

    all

  • ubuntu•linux-aws-5.13

    all

  • ubuntu•linux-aws-5.15

    < 5.15.0-1093.100~20.04.1

  • ubuntu•linux-aws-5.19

    all

  • ubuntu•linux-aws-5.3

    all

  • ubuntu•linux-aws-5.4

    < 5.4.0-1151.161~18.04.1

  • ubuntu•linux-aws-5.8

    all

  • ubuntu•linux-aws-6.14

    < 6.14.0-1014.14~24.04.1

  • ubuntu•linux-aws-6.2

    all

  • ubuntu•linux-aws-6.5

    all

  • ubuntu•linux-aws-6.8

    < 6.8.0-1040.42~22.04.1

  • ubuntu•linux-aws-fips

    < 4.15.0-2123.129 | all | < 5.4.0-1151.161+fips1 | < 5.15.0-1093.100+fips1 | < 6.8.0-1040.42+fips1

  • ubuntu•linux-aws-hwe

    < 4.15.0-1185.198~16.04.1

  • ubuntu•linux-azure

    < 4.15.0-1193.208~14.04.1 | < 4.15.0-1193.208~16.04.1 | all | < 5.4.0-1154.161 | < 5.15.0-1097.106 | < 6.8.0-1040.46

  • ubuntu•linux-azure-4.15

    < 4.15.0-1193.208

  • ubuntu•linux-azure-5.11

    all

  • ubuntu•linux-azure-5.13

    all

  • ubuntu•linux-azure-5.15

    < 5.15.0-1097.106~20.04.1

  • ubuntu•linux-azure-5.19

    all

  • ubuntu•linux-azure-5.3

    all

  • ubuntu•linux-azure-5.4

    < 5.4.0-1154.161~18.04.1

  • ubuntu•linux-azure-5.8

    all

  • ubuntu•linux-azure-6.11

    all

  • ubuntu•linux-azure-6.14

    < 6.14.0-1013.13~24.04.1

  • ubuntu•linux-azure-6.2

    all

  • ubuntu•linux-azure-6.5

    all

  • ubuntu•linux-azure-6.8

    < 6.8.0-1040.46~22.04.1

  • ubuntu•linux-azure-edge

    all

  • ubuntu•linux-azure-fde

    all | all | all

  • ubuntu•linux-azure-fde-5.19

    all

  • ubuntu•linux-azure-fde-6.2

    all

  • ubuntu•linux-azure-fips

    < 4.15.0-2102.108 | all | < 5.4.0-1155.162+fips1 | < 5.15.0-1097.106+fips1 | < 6.8.0-1040.46+fips1

  • ubuntu•linux-azure-nvidia

    < 6.8.0-1025.27

  • ubuntu•linux-azure-nvidia-6.14

    < 6.14.0-1007.7

  • ubuntu•linux-bluefield

    all | < 5.4.0-1110.117 | < 5.15.0-1077.79 | < 6.8.0-1012.16

  • ubuntu•linux-fips

    all | < 4.15.0-1140.151 | < 5.4.0-1125.135 | < 5.15.0-157.167+fips1 | < 6.8.0-85.85+fips1

  • ubuntu•linux-gcp

    < 4.15.0-1178.195~16.04.1 | all | < 5.4.0-1154.163 | < 5.15.0-1093.102 | < 6.8.0-1041.43

  • ubuntu•linux-gcp-4.15

    < 4.15.0-1178.195

  • ubuntu•linux-gcp-5.11

    all

  • ubuntu•linux-gcp-5.13

    all

  • ubuntu•linux-gcp-5.15

    < 5.15.0-1093.102~20.04.1

  • ubuntu•linux-gcp-5.19

    all

  • ubuntu•linux-gcp-5.3

    all

  • ubuntu•linux-gcp-5.4

    < 5.4.0-1154.163~18.04.1

Showing first 50 affected entries in server-rendered view.

References (55)