HighFix available
ext4: reject mount if bigalloc with s_first_data_block != 0
Type: advisorySources: OSV
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.253, 5.15.203, 6.1.168, 6.12.80, 6.18.21, 6.19.11, 6.6.131
- CVEs
- CVE-2026-31447
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 03:18 UTC · Revision 1
Source evidence
ext4: reject mount if bigalloc with s_first_data_block != 0
core-osv · Original sourcePublished 22 Apr 2026, 13:53 UTC
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.
osv:CVE-2026-31447
Kernel
Fixed versions: 5.10.253, 5.15.203, 6.1.168, 6.6.131, 6.12.80, 6.18.21, 6.19.11
Complete source record
{
"id": "46b3317557239ca540ce91f588bf1a49e531efdfce8554c92578155b8c8e0cda",
"url": "https://osv.dev/vulnerability/CVE-2026-31447",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ext4: reject mount if bigalloc with s_first_data_block != 0",
"summary": "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.",
"evidence": "osv:CVE-2026-31447",
"products": [
{
"name": {
"value": "Kernel",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "5.10.253",
"evidence": "/affected/1/ranges"
},
{
"value": "5.15.203",
"evidence": "/affected/1/ranges"
},
{
"value": "6.1.168",
"evidence": "/affected/1/ranges"
},
{
"value": "6.6.131",
"evidence": "/affected/1/ranges"
},
{
"value": "6.12.80",
"evidence": "/affected/1/ranges"
},
{
"value": "6.18.21",
"evidence": "/affected/1/ranges"
},
{
"value": "6.19.11",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "CVE-2026-31447",
"aliases": [
"CVE-2026-31447"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "281b59959707dfae03ce038cdf231bf4904e170c"
},
{
"fixed": "5ad6d994255e27a3254079dfb50ca861fc31f2d0"
},
{
"fixed": "3a926957cc95899ef88529710836edadc03c71a1"
},
{
"fixed": "7b58c110b4e1f028eb38eec9ed3555e9be81c8b0"
},
{
"fixed": "b77de3fceafbb39f30e4ff5dc986f863d5456417"
},
{
"fixed": "d787d3ae96648dc14a3b7ca8fde817177e82c1c7"
},
{
"fixed": "ad1f6d608f33f59d21a3d025615d6786a6443998"
},
{
"fixed": "7d5b04290156c3fc316eecc86a4f9d201ab7d44a"
},
{
"fixed": "3822743dc20386d9897e999dbb990befa3a5b3f8"
}
]
}
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31447.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "3.2.0"
},
{
"fixed": "5.10.253"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.11.0"
},
{
"fixed": "5.15.203"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.16.0"
},
{
"fixed": "6.1.168"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.2.0"
},
{
"fixed": "6.6.131"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.7.0"
},
{
"fixed": "6.12.80"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.13.0"
},
{
"fixed": "6.18.21"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.19.0"
},
{
"fixed": "6.19.11"
}
]
}
],
"package": {
"name": "Kernel",
"ecosystem": "Linux"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31447.json"
}
}
],
"modified": "2026-10-28T02:30:49.335742007Z",
"provider": "osv",
"references": [
"https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
"https://cert-portal.siemens.com/productcert/html/ssa-082556.html",
"https://cert-portal.siemens.com/productcert/html/ssa-457936.html",
"https://git.kernel.org/stable/c/3822743dc20386d9897e999dbb990befa3a5b3f8",
"https://git.kernel.org/stable/c/3a926957cc95899ef88529710836edadc03c71a1",
"https://git.kernel.org/stable/c/5ad6d994255e27a3254079dfb50ca861fc31f2d0",
"https://git.kernel.org/stable/c/7b58c110b4e1f028eb38eec9ed3555e9be81c8b0",
"https://git.kernel.org/stable/c/7d5b04290156c3fc316eecc86a4f9d201ab7d44a",
"https://git.kernel.org/stable/c/ad1f6d608f33f59d21a3d025615d6786a6443998",
"https://git.kernel.org/stable/c/b77de3fceafbb39f30e4ff5dc986f863d5456417",
"https://git.kernel.org/stable/c/d787d3ae96648dc14a3b7ca8fde817177e82c1c7",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31447.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-31447",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31447.json"
}
},
"related_cves": [
{
"value": "CVE-2026-31447",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 517691,
"published_at": "2026-04-22T13:53:43.467+00:00"
}