CVE-2025-38477 (GCVE-0-2025-38477)

Vulnerability from cvelistv5 – Published: 2025-07-28 11:21 – Updated: 2026-07-14 12:42
VLAI
Title
net/sched: sch_qfq: Fix race condition on qfq_aggregate
Summary
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < aa7a22c4d678bf649fd3a1d27debec583563414d (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < d841aa5518508ab195b6781ad0d73ee378d713dd (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < c6df794000147a3a02f79984aada4ce83f8d0a1e (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < 466e10194ab81caa2ee6a332d33ba16bcceeeba6 (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < fbe48f06e64134dfeafa89ad23387f66ebca3527 (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < a6d735100f602c830c16d69fb6d780eebd8c9ae1 (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < c000a3a330d97f6c073ace5aa5faf94b9adb4b79 (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < 5e28d5a3f774f118896aec17a3a20a9c5c9dfc64 (git)
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Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.147 , ≤ 6.1.* (semver)
Unaffected: 6.6.100 , ≤ 6.6.* (semver)
Unaffected: 6.12.40 , ≤ 6.12.* (semver)
Unaffected: 6.15.8 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
Create a notification for this product.
Show details on NVD website
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    "redhat_vex": {
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      "current_release_date": "2026-06-30T01:09:08+00:00",
      "cve": "CVE-2025-38477",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/sched: sch_qfq: Fix race condition on qfq_aggregate",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38477.json",
      "version": "3"
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      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.