CVE-2025-70100

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-06-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this weekElevated
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: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A divide-by-zero vulnerability in the ext4_block_set_lb_size function in src/ext4_blockdev.c of the lwext4 1.0.0 library allows attackers to cause a denial of service by providing a malformed ext4 filesystem image that results in a zero logical block size. The vulnerability is triggered during mount or image processing and leads to a Floating-Point Exception (FPE) under sanitizers or a runtime crash in standard builds due to missing validation of lb_size.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

June 3, 2026

Last Modified

July 22, 2026

Advisory Details (3)

Auto-updated Jun 16, 2026
No patch confirmed yet.
generic

[security] lwext4/src/ext4_blockdev.c FPE in ext4_block_set_lb_size · Issue #90 · gkostka/lwext4 · GitHub

https://github.com/gkostka/lwext4/issues/90
generic

sigdevel: "Security Advisory: CVE-2025-70100 - Divide By Zer…" - Infosec Exchange

https://infosec.exchange/@sigdevel/116668952003072580
generic

pocs/res/lwext4/2/sig8_2_lwext4_ext4_blockdev_c_127 at main · sigdevel/pocs · GitHub

https://github.com/sigdevel/pocs/blob/main/res/lwext4/2/sig8_2_lwext4_ext4_blockdev_c_127

Vendor Advisories for CVE-2025-70100(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 36× 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 200 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2025-70100?
CVE-2025-70100 is a medium vulnerability published on June 3, 2026. A divide-by-zero vulnerability in the ext4blocksetlbsize function in src/ext4blockdev.c of the lwext4 1.0.0 library allows attackers to cause a denial of service by providing a malformed ext4 filesystem image that results in a zero logical block size. The vulnerability is triggered during mount or…
When was CVE-2025-70100 disclosed?
CVE-2025-70100 was first published in the National Vulnerability Database on June 3, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-70100 actively exploited?
CVE-2025-70100 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 94.3% of all scored CVEs.
What is the CVSS score of CVE-2025-70100?
CVE-2025-70100 has a CVSS v3.1 base score of 5.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2025-70100?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-70100, 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

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