CVE-2025-38000

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2025-06-06. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue()

When enqueuing the first packet to an HFSC class, hfsc_enqueue() calls the child qdisc's peek() operation before incrementing sch->q.qlen and sch->qstats.backlog. If the child qdisc uses qdisc_peek_dequeued(), this may trigger an immediate dequeue and potential packet drop. In such cases, qdisc_tree_reduce_backlog() is called, but the HFSC qdisc's qlen and backlog have not yet been updated, leading to inconsistent queue accounting. This can leave an empty HFSC class in the active list, causing further consequences like use-after-free.

This patch fixes the bug by moving the increment of sch->q.qlen and sch->qstats.backlog before the call to the child qdisc's peek() operation. This ensures that queue length and backlog are always accurate when packet drops or dequeues are triggered during the peek.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

June 6, 2025

Last Modified

August 5, 2026

Advisory Details (10)

Auto-updated Jul 31, 2026
Patch available.
generic Patch Available

[SECURITY] [DLA 4328-1] linux-6.1 security update

https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
generic Patch Available

[SECURITY] [DLA 4327-1] linux security update

https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
generic

sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f9f593e34d2fb67644372c8f7b033bdc622ad228
generic

sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f1dde3eb17dc1b8bd07aed00004b1e05fc87a3d4
generic

sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/93c276942e75de0e5bc91576300d292e968f5a02
generic

sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/89c301e929a0db14ebd94b4d97764ce1d6981653
generic

sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/49b21795b8e5654a7df3d910a12e1060da4c04cf
generic

sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3f981138109f63232a5fb7165938d4c945cc1b9d
generic

sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3f3a22eebbc32b4fa8ce9c1d5f9db214b45b9335
generic

sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1034e3310752e8675e313f7271b348914008719a

Vendor Advisories for CVE-2025-38000(16)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(25)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-aws-edge (6.14.0-1009.9~24.04.1) @ noble2026-07-30ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.4.0-1066 (5.4.0-1066.70) @ focal2026-07-30ubuntu
ubuntulinux-tools-raspi2-hwe-18.04-edge (5.4.0.1131.162) @ focal2026-07-30ubuntu
ubuntulinux-tools-azure-lts-22.04 (5.15.0.1092.90) @ jammy2026-07-30ubuntu
ubuntulinux-tools-iot-5.4 (5.4.0.1052.50) @ focal2026-07-30ubuntu
ubuntulinux-tools-azure-edge (5.15.0.1094.103~20.04.1) @ focal2026-07-30ubuntu
ubuntulinux-tools-raspi-nolpae (5.15.0.1083.81) @ jammy2026-07-30ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1094.79) @ jammy2026-07-30ubuntu
ubuntulinux-virtual-6.8 (6.8.0-63.66) @ noble2026-07-30ubuntu
ubuntulinux-tools-gcp-fips-5.15 (5.15.0.1086.76) @ jammy2026-07-30ubuntu
ubuntulinux-tools-aws-edge (5.15.0.1087.94~20.04.1) @ focal2026-07-30ubuntu
ubuntulinux-tools-oem-6.14 (6.14.0-1006.6) @ noble2026-07-30ubuntu
ubuntulinux-virtual-hwe-24.04-edge (6.14.0-23.23) @ plucky2026-07-30ubuntu
redhatkernel-0:5.14.0-611.5.1.el9_72025-11-11redhat
redhatkpatch-patch2025-09-24redhat
redhatkernel-0:4.18.0-305.170.1.el8_42025-09-02redhat
redhatkernel-0:5.14.0-70.144.1.el9_02025-08-27redhat
redhatkernel-0:4.18.0-372.158.1.el8_62025-08-27redhat
redhatkernel-rt-0:3.10.0-1160.137.1.rt56.1289.el72025-08-27redhat
redhatkernel-0:3.10.0-1160.137.1.el72025-08-27redhat
redhatkernel-0:4.18.0-193.165.1.el8_22025-08-27redhat
redhatkernel-0:3.10.0-1062.99.1.el72025-08-25redhat
redhatkernel-0:4.18.0-477.107.1.el8_82025-08-25redhat
redhatkernel-0:5.14.0-284.128.1.el9_22025-07-29redhat
linuxKernel @ 5.4.294—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(9)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 9× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 107 total refreshes for this CVE.

  1. 2026-08-07 16:26 UTCEPSS rescore
  2. 2026-08-06 13:46 UTCEPSS rescore
  3. 2026-08-05 13:55 UTCEG score recompute
  4. 2026-08-05 13:55 UTCVendor advisory
  5. 2026-08-05 13:55 UTCGHSA enrichment
  6. 2026-08-04 15:09 UTCEPSS rescore
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  11. 2026-07-30 16:27 UTCEPSS rescore
  12. 2026-07-30 07:10 UTCEG score recompute
  13. 2026-07-30 07:10 UTCVendor advisory
  14. 2026-07-30 07:09 UTCGHSA enrichment
  15. 2026-07-30 01:29 UTCEPSS rescore
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  21. 2026-07-24 04:11 UTCOSV refresh
  22. 2026-07-23 02:54 UTCEG score recompute
  23. 2026-07-22 14:07 UTCEPSS rescore
  24. 2026-07-22 14:07 UTCEPSS rescore
  25. 2026-07-21 15:24 UTCEPSS rescore
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  21. 2026-07-07 13:45 UTCEPSS rescore
  22. 2026-07-06 23:35 UTCOSV refresh
  23. 2026-07-06 02:23 UTCEPSS rescore
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  25. 2026-07-04 06:30 UTCEPSS rescore
  26. 2026-07-01 15:06 UTCEPSS rescore
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  50. 2026-06-18 17:52 UTCEPSS rescore
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  52. 2026-06-18 10:43 UTCOSV refresh
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Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2025-38000?
CVE-2025-38000 is a high vulnerability published on June 6, 2025. In the Linux kernel, the following vulnerability has been resolved: schhfsc: Fix qlen accounting bug when using peek in hfscenqueue() When enqueuing the first packet to an HFSC class, hfsc_enqueue() calls the child qdisc's peek() operation before incrementing sch->q.qlen and sch->qstats.backlog. If…
When was CVE-2025-38000 disclosed?
CVE-2025-38000 was first published in the National Vulnerability Database on June 6, 2025, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-38000 actively exploited?
CVE-2025-38000 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 91.6% of all scored CVEs.
What is the CVSS score of CVE-2025-38000?
CVE-2025-38000 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2025-38000?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-38000, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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