CVE-2026-31447

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-04-22. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

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

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

ext4: reject mount if bigalloc with s_first_data_block != 0

bigalloc with s_first_data_block != 0 is not supported, reject mounting it.

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
4.0%
KEV
Not listed

Published

April 22, 2026

Last Modified

July 14, 2026

Advisory Details (8)

Auto-updated May 7, 2026
No patch confirmed yet.
generic

ext4: reject mount if bigalloc with s_first_data_block != 0 - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d787d3ae96648dc14a3b7ca8fde817177e82c1c7
generic

ext4: reject mount if bigalloc with s_first_data_block != 0 - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b77de3fceafbb39f30e4ff5dc986f863d5456417
generic

ext4: reject mount if bigalloc with s_first_data_block != 0 - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ad1f6d608f33f59d21a3d025615d6786a6443998
generic

ext4: reject mount if bigalloc with s_first_data_block != 0 - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7d5b04290156c3fc316eecc86a4f9d201ab7d44a
generic

ext4: reject mount if bigalloc with s_first_data_block != 0 - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7b58c110b4e1f028eb38eec9ed3555e9be81c8b0
generic

ext4: reject mount if bigalloc with s_first_data_block != 0 - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5ad6d994255e27a3254079dfb50ca861fc31f2d0
generic

ext4: reject mount if bigalloc with s_first_data_block != 0 - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3a926957cc95899ef88529710836edadc03c71a1
generic

ext4: reject mount if bigalloc with s_first_data_block != 0 - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3822743dc20386d9897e999dbb990befa3a5b3f8

Vendor Advisories for CVE-2026-31447(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 37× 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 154 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-31447?
CVE-2026-31447 is a high vulnerability published on April 22, 2026. In the Linux kernel, the following vulnerability has been resolved: ext4: reject mount if bigalloc with sfirstdata_block != 0 bigalloc with sfirstdata_block != 0 is not supported, reject mounting it.
When was CVE-2026-31447 disclosed?
CVE-2026-31447 was first published in the National Vulnerability Database on April 22, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31447 actively exploited?
CVE-2026-31447 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-31447?
CVE-2026-31447 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-31447?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31447, 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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