CVE-2025-70099

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-01. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

A NULL pointer dereference in the ext4_dir_en_get_name_len function in include/ext4_dir.h of lwext4 1.0.0 allows attackers to cause a denial of service by supplying a specially crafted EXT4 filesystem image with malformed directory entries. During directory iteration, the code may fail to validate the directory entry pointer before accessing the name_len field, resulting in a segmentation fault. This affects versions based on (or equivalent to) the 2016-era codebase (1.0.0).

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

June 1, 2026

Last Modified

July 22, 2026

Advisory Details (3)

Auto-updated Jun 6, 2026
No patch confirmed yet.
generic

[security] lwext4/include/ext4_dir.h NULL pointer dereference in ext4_dir_en_get_name_len · Issue #89 · gkostka/lwext4 · GitHub

https://github.com/gkostka/lwext4/issues/89
generic

sigdevel: "Security Advisory: CVE-2025-70099 - NULL Pointer …" - Infosec Exchange

https://infosec.exchange/@sigdevel/116668939725424227
generic

pocs/res/lwext4/1/sig11_2_1_lwext4_ext4_dir_h_126 at main · sigdevel/pocs · GitHub

https://github.com/sigdevel/pocs/blob/main/res/lwext4/1/sig11_2_1_lwext4_ext4_dir_h_126

Vendor Advisories for CVE-2025-70099(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 9× 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 245 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 06:13 UTCEG score recompute
  4. 2026-09-14 06:13 UTCGHSA enrichment
  5. 2026-09-13 16:46 UTCEPSS rescore
  6. 2026-09-12 15:00 UTCEPSS rescore
  7. 2026-09-11 14:52 UTCEPSS rescore
  8. 2026-09-11 09:36 UTCEPSS rescore
  9. 2026-09-10 09:34 UTCEPSS rescore
  10. 2026-09-08 22:00 UTCEPSS rescore
  11. 2026-09-07 16:00 UTCEPSS rescore
  12. 2026-09-06 13:47 UTCEPSS rescore
  13. 2026-09-04 05:06 UTCEPSS rescore
  14. 2026-09-02 14:11 UTCEPSS rescore
  15. 2026-09-01 13:53 UTCEPSS rescore
  16. 2026-08-30 01:21 UTCEPSS rescore
  17. 2026-08-28 21:40 UTCEPSS rescore
  18. 2026-08-27 14:24 UTCEPSS rescore
  19. 2026-08-26 14:45 UTCEPSS rescore
  20. 2026-08-25 13:48 UTCEPSS rescore
  21. 2026-08-25 04:04 UTCEG score recompute
  22. 2026-08-25 04:04 UTCGHSA enrichment
  23. 2026-08-24 14:16 UTCEPSS rescore
  24. 2026-08-23 13:59 UTCEG score recompute
  25. 2026-08-23 13:59 UTCGHSA enrichment
Show 75 more
  1. 2026-08-23 00:18 UTCEPSS rescore
  2. 2026-08-21 23:48 UTCEPSS rescore
  3. 2026-08-21 14:55 UTCEG score recompute
  4. 2026-08-21 14:55 UTCGHSA enrichment
  5. 2026-08-20 22:55 UTCEPSS rescore
  6. 2026-08-20 22:28 UTCGHSA enrichment
  7. 2026-08-20 10:21 UTCEG score recompute
  8. 2026-08-20 10:21 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. 2026-08-17 06:48 UTCGHSA enrichment
  13. 2026-08-16 16:06 UTCEG score recompute
  14. 2026-08-16 16:06 UTCGHSA enrichment
  15. 2026-08-16 14:55 UTCEPSS rescore
  16. 2026-08-16 04:13 UTCEG score recompute
  17. 2026-08-16 04:13 UTCGHSA enrichment
  18. 2026-08-16 02:14 UTCEPSS rescore
  19. 2026-08-15 16:20 UTCEG score recompute
  20. 2026-08-15 16:20 UTCGHSA enrichment
  21. 2026-08-15 01:30 UTCEPSS rescore
  22. 2026-08-14 23:13 UTCGHSA enrichment
  23. 2026-08-14 11:20 UTCGHSA enrichment
  24. 2026-08-13 23:26 UTCEG score recompute
  25. 2026-08-13 23:26 UTCGHSA enrichment
  26. 2026-08-13 22:00 UTCEPSS rescore
  27. 2026-08-13 11:03 UTCGHSA enrichment
  28. 2026-08-12 23:10 UTCEG score recompute
  29. 2026-08-12 23:10 UTCGHSA enrichment
  30. 2026-08-12 13:50 UTCEPSS rescore
  31. 2026-08-12 11:17 UTCGHSA enrichment
  32. 2026-08-11 23:15 UTCEG score recompute
  33. 2026-08-11 23:15 UTCGHSA enrichment
  34. 2026-08-11 13:42 UTCEPSS rescore
  35. 2026-08-11 11:21 UTCEG score recompute
  36. 2026-08-11 11:21 UTCGHSA enrichment
  37. 2026-08-10 23:59 UTCEPSS rescore
  38. 2026-08-10 23:28 UTCGHSA enrichment
  39. 2026-08-10 07:40 UTCGHSA enrichment
  40. 2026-08-09 19:47 UTCEG score recompute
  41. 2026-08-09 19:47 UTCGHSA enrichment
  42. 2026-08-09 13:46 UTCEPSS rescore
  43. 2026-08-09 07:54 UTCGHSA enrichment
  44. 2026-08-08 20:01 UTCEG score recompute
  45. 2026-08-08 20:01 UTCGHSA enrichment
  46. 2026-08-08 16:36 UTCEPSS rescore
  47. 2026-08-08 08:06 UTCGHSA enrichment
  48. 2026-08-07 20:13 UTCEG score recompute
  49. 2026-08-07 20:13 UTCGHSA enrichment
  50. 2026-08-07 16:27 UTCEPSS rescore
  51. 2026-08-07 08:19 UTCGHSA enrichment
  52. 2026-08-06 20:26 UTCEG score recompute
  53. 2026-08-06 20:26 UTCGHSA enrichment
  54. 2026-08-06 13:46 UTCEPSS rescore
  55. 2026-08-06 08:33 UTCGHSA enrichment
  56. 2026-08-05 20:40 UTCEG score recompute
  57. 2026-08-05 20:40 UTCGHSA enrichment
  58. 2026-08-05 19:17 UTCEPSS rescore
  59. 2026-08-04 22:50 UTCEG score recompute
  60. 2026-08-04 22:50 UTCGHSA enrichment
  61. 2026-08-04 10:37 UTCEPSS rescore
  62. 2026-08-04 03:46 UTCGHSA enrichment
  63. 2026-08-03 15:53 UTCEG score recompute
  64. 2026-08-03 15:53 UTCGHSA enrichment
  65. 2026-08-03 10:35 UTCEPSS rescore
  66. 2026-08-03 01:27 UTCGHSA enrichment
  67. 2026-08-02 13:33 UTCEG score recompute
  68. 2026-08-02 13:33 UTCGHSA enrichment
  69. 2026-08-02 02:26 UTCEPSS rescore
  70. 2026-08-02 01:40 UTCGHSA enrichment
  71. 2026-08-01 13:47 UTCEG score recompute
  72. 2026-08-01 13:47 UTCGHSA enrichment
  73. 2026-08-01 04:15 UTCEPSS rescore
  74. 2026-07-31 19:02 UTCGHSA enrichment
  75. 2026-07-31 05:48 UTCEG score recompute

Frequently asked(5)

What is CVE-2025-70099?
CVE-2025-70099 is a high vulnerability published on June 1, 2026. A NULL pointer dereference in the ext4direngetnamelen function in include/ext4dir.h of lwext4 1.0.0 allows attackers to cause a denial of service by supplying a specially crafted EXT4 filesystem image with malformed directory entries. During directory iteration, the code may fail to validate the…
When was CVE-2025-70099 disclosed?
CVE-2025-70099 was first published in the National Vulnerability Database on June 1, 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-2025-70099 actively exploited?
CVE-2025-70099 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 68.0% of all scored CVEs.
What is the CVSS score of CVE-2025-70099?
CVE-2025-70099 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2025-70099?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-70099, 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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