CVE-2026-31447

HIGHNVD 7.87.8—

7.8

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(high)
EPSS: 2.9%
KEV: Not listed

Published

April 22, 2026

Last Modified

May 7, 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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Microsoft MSRCCVE-2026-314472026-04-23
ext4: reject mount if bigalloc with s_first_data_block != 0

Data Freshness Timeline

(refreshed 17× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-24 16:59 UTCepss_batch
2026-05-23 15:21 UTCepss_batch
2026-05-22 21:16 UTCepss_batch

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 May 7, 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 2.9% 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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-31447

Explore →

Is Your Infrastructure Affected by CVE-2026-31447?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2026-31447

📅 Published

🔄 Last Modified

📋 Advisory Details (8)

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

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

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

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

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

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

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

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

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-31447?

🔗 Related CVEs(same vendor)

Same vendor

Published

Last Modified

Advisory Details (8)

Frequently asked(5)

Related CVEs(same vendor)