CVE-2026-31447

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

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

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
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

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)
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
4%
KEV
Not listed

Published

April 22, 2026

Last Modified

August 5, 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.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 5.10.253—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.

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (53 versions)5.10.257-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.164-1~deb11u1 (16 versions)6.1.170-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (48 versions)6.1.170-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (121 versions)6.19.11-1—

Additional Vendor Advisories

(24)

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 8× in last 7d / 64× 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 241 total refreshes for this CVE.

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

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 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-2026-31447 actively exploited?
CVE-2026-31447 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 96.1% of all scored CVEs.
What is the CVSS score of CVE-2026-31447?
CVE-2026-31447 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
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.

Dependency Blast Radius

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