CVE-2025-38177

MEDIUMNVD 5.55.5
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2025-07-04. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

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

sch_hfsc: make hfsc_qlen_notify() idempotent

hfsc_qlen_notify() is not idempotent either and not friendly to its callers, like fq_codel_dequeue(). Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers' life:

  • update_vf() decreases cl->cl_nactive, so we can check whether it is
non-zero before calling it.
  • eltree_remove() always removes RB node cl->el_node, but we can use
RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

July 4, 2025

Last Modified

August 5, 2026

Advisory Details (10)

Auto-updated Aug 2, 2026
Patch available.
generic Patch Available

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

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

[SECURITY] [DLA 4271-1] linux-6.1 security update

https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html
generic

sch_hfsc: make hfsc_qlen_notify() idempotent - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d06476714d2819b550e0cc39222347e2c8941c9d
generic

sch_hfsc: make hfsc_qlen_notify() idempotent - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c1175c4ad01dbc9c979d099861fa90a754f72059
generic

sch_hfsc: make hfsc_qlen_notify() idempotent - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a5efc95a33bd4fcb879250852828cc58c7862970
generic

sch_hfsc: make hfsc_qlen_notify() idempotent - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9a5fd5c2f4d4afdd5e405083ee53e0789ce76956
generic

sch_hfsc: make hfsc_qlen_notify() idempotent - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9030a91235ae4845ec71902c3e0cecfc9ed1f2df
generic

sch_hfsc: make hfsc_qlen_notify() idempotent - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/72c61ffbeeb8c50f6d4d70c65d3283aa1bac57a7
generic

sch_hfsc: make hfsc_qlen_notify() idempotent - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/51eb3b65544c9efd6a1026889ee5fb5aa62da3bb
generic

sch_hfsc: make hfsc_qlen_notify() idempotent - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87

Patch Availability(21)

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.

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (46 versions)5.10.244-1
linux-6.16.1.106-3~deb11u1 ... 6.1.137-1~deb11u1 (8 versions)6.1.140-1~deb11u1
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (39 versions)6.1.139-1
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.29-1
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.29-1

Weakness Classification(1)

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

Additional Vendor Advisories

(10)

Data Freshness Timeline

(refreshed 5× in last 7d / 26× 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 141 total refreshes for this CVE.

  1. 2026-09-07 16:00 UTCEPSS rescore
  2. 2026-09-07 11:48 UTCOSV refresh
  3. 2026-09-06 13:46 UTCEPSS rescore
  4. 2026-09-04 05:05 UTCEPSS rescore
  5. 2026-09-02 14:11 UTCEPSS rescore
  6. 2026-09-01 13:53 UTCEPSS rescore
  7. 2026-09-01 04:38 UTCEPSS rescore
  8. 2026-08-30 19:16 UTCEPSS rescore
  9. 2026-08-30 01:21 UTCEPSS rescore
  10. 2026-08-28 21:40 UTCEPSS rescore
  11. 2026-08-27 14:24 UTCEPSS rescore
  12. 2026-08-26 14:45 UTCEPSS rescore
  13. 2026-08-25 13:48 UTCEPSS rescore
  14. 2026-08-23 00:18 UTCEPSS rescore
  15. 2026-08-21 23:48 UTCEPSS rescore
  16. 2026-08-20 22:54 UTCEPSS rescore
  17. 2026-08-20 21:01 UTCOSV refresh
  18. 2026-08-19 17:03 UTCEPSS rescore
  19. 2026-08-19 17:03 UTCEPSS rescore
  20. 2026-08-18 13:47 UTCEPSS rescore
  21. 2026-08-17 13:46 UTCEPSS rescore
  22. 2026-08-16 14:55 UTCEPSS rescore
  23. 2026-08-16 02:13 UTCEPSS rescore
  24. 2026-08-15 01:29 UTCEPSS rescore
  25. 2026-08-13 21:59 UTCEPSS rescore
Show 75 more
  1. 2026-08-12 13:50 UTCEPSS rescore
  2. 2026-08-09 13:46 UTCEPSS rescore
  3. 2026-08-08 16:36 UTCEPSS rescore
  4. 2026-08-07 16:26 UTCEPSS rescore
  5. 2026-08-06 13:46 UTCEPSS rescore
  6. 2026-08-05 13:06 UTCEG score recompute
  7. 2026-08-05 13:06 UTCVendor advisory
  8. 2026-08-05 13:06 UTCGHSA enrichment
  9. 2026-08-04 15:09 UTCEPSS rescore
  10. 2026-08-04 10:37 UTCEPSS rescore
  11. 2026-08-03 10:35 UTCEPSS rescore
  12. 2026-08-02 02:26 UTCEPSS rescore
  13. 2026-08-01 04:15 UTCEPSS rescore
  14. 2026-07-30 16:27 UTCEPSS rescore
  15. 2026-07-30 07:07 UTCEG score recompute
  16. 2026-07-30 07:07 UTCVendor advisory
  17. 2026-07-30 07:07 UTCGHSA enrichment
  18. 2026-07-30 06:24 UTCNVD updateCVSS v3 → 5.5 · severity → MEDIUM
  19. 2026-07-30 01:29 UTCEPSS rescore
  20. 2026-07-28 15:35 UTCEPSS rescore
  21. 2026-07-26 14:54 UTCEPSS rescore
  22. 2026-07-25 14:17 UTCEPSS rescore
  23. 2026-07-25 14:17 UTCEPSS rescore
  24. 2026-07-24 14:17 UTCEPSS rescore
  25. 2026-07-24 02:11 UTCOSV refresh
  26. 2026-07-23 02:54 UTCEG score recompute
  27. 2026-07-22 14:07 UTCEPSS rescore
  28. 2026-07-22 14:07 UTCEPSS rescore
  29. 2026-07-21 15:24 UTCEPSS rescore
  30. 2026-07-20 17:07 UTCEPSS rescore
  31. 2026-07-19 14:30 UTCEPSS rescore
  32. 2026-07-19 14:30 UTCEPSS rescore
  33. 2026-07-19 02:28 UTCEPSS rescore
  34. 2026-07-19 02:28 UTCEPSS rescore
  35. 2026-07-18 10:04 UTCEPSS rescore
  36. 2026-07-18 10:04 UTCEPSS rescore
  37. 2026-07-16 17:02 UTCEPSS rescore
  38. 2026-07-15 16:57 UTCEPSS rescore
  39. 2026-07-15 16:57 UTCEPSS rescore
  40. 2026-07-15 01:59 UTCEPSS rescore
  41. 2026-07-15 01:59 UTCEPSS rescore
  42. 2026-07-13 22:29 UTCEPSS rescore
  43. 2026-07-13 22:29 UTCEPSS rescore
  44. 2026-07-13 06:12 UTCEPSS rescore
  45. 2026-07-12 05:46 UTCEPSS rescore
  46. 2026-07-11 08:27 UTCEPSS rescore
  47. 2026-07-11 08:27 UTCEPSS rescore
  48. 2026-07-09 19:09 UTCEPSS rescore
  49. 2026-07-09 19:09 UTCEPSS rescore
  50. 2026-07-07 13:45 UTCEPSS rescore
  51. 2026-07-06 20:34 UTCOSV refresh
  52. 2026-07-06 16:27 UTCEPSS rescore
  53. 2026-07-06 16:27 UTCEPSS rescore
  54. 2026-07-06 02:23 UTCEPSS rescore
  55. 2026-07-05 02:30 UTCEPSS rescore
  56. 2026-07-04 06:30 UTCEPSS rescore
  57. 2026-07-01 15:06 UTCEPSS rescore
  58. 2026-07-01 15:06 UTCEPSS rescore
  59. 2026-06-30 23:22 UTCEPSS rescore
  60. 2026-06-30 23:22 UTCEPSS rescore
  61. 2026-06-29 14:06 UTCEPSS rescore
  62. 2026-06-29 14:06 UTCEPSS rescore
  63. 2026-06-28 14:07 UTCEPSS rescore
  64. 2026-06-28 14:07 UTCEPSS rescore
  65. 2026-06-28 04:55 UTCEPSS rescore
  66. 2026-06-28 04:55 UTCEPSS rescore
  67. 2026-06-27 03:08 UTCEPSS rescore
  68. 2026-06-27 03:08 UTCEPSS rescore
  69. 2026-06-25 13:49 UTCEPSS rescore
  70. 2026-06-25 13:49 UTCEPSS rescore
  71. 2026-06-24 14:04 UTCEPSS rescore
  72. 2026-06-24 14:04 UTCEPSS rescore
  73. 2026-06-23 21:32 UTCEPSS rescore
  74. 2026-06-23 21:32 UTCEPSS rescore
  75. 2026-06-22 14:25 UTCEPSS rescore

Frequently asked(5)

What is CVE-2025-38177?
CVE-2025-38177 is a medium vulnerability published on July 4, 2025. In the Linux kernel, the following vulnerability has been resolved: schhfsc: make hfscqlen_notify() idempotent hfscqlennotify() is not idempotent either and not friendly to its callers, like fqcodeldequeue(). Let's make it idempotent to ease qdisctreereduce_backlog() callers' life: 1. updatevf()…
When was CVE-2025-38177 disclosed?
CVE-2025-38177 was first published in the National Vulnerability Database on July 4, 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-2025-38177 actively exploited?
CVE-2025-38177 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 93.7% of all scored CVEs.
What is the CVSS score of CVE-2025-38177?
CVE-2025-38177 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2025-38177?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-38177, 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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2025-38177

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