ext4: reject mount if bigalloc with s_first_data_block != 0

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Summary

CVECVE-2026-31447
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 14:16:38 UTC
Updated2026-07-14 13:18:41 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.000240000 probability, percentile 0.067850000 (date 2026-04-27)

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 281b59959707dfae03ce038cdf231bf4904e170c 5ad6d994255e27a3254079dfb50ca861fc31f2d0 git Not specified
CNA Linux Linux affected 281b59959707dfae03ce038cdf231bf4904e170c 3a926957cc95899ef88529710836edadc03c71a1 git Not specified
CNA Linux Linux affected 281b59959707dfae03ce038cdf231bf4904e170c 7b58c110b4e1f028eb38eec9ed3555e9be81c8b0 git Not specified
CNA Linux Linux affected 281b59959707dfae03ce038cdf231bf4904e170c b77de3fceafbb39f30e4ff5dc986f863d5456417 git Not specified
CNA Linux Linux affected 281b59959707dfae03ce038cdf231bf4904e170c d787d3ae96648dc14a3b7ca8fde817177e82c1c7 git Not specified
CNA Linux Linux affected 281b59959707dfae03ce038cdf231bf4904e170c ad1f6d608f33f59d21a3d025615d6786a6443998 git Not specified
CNA Linux Linux affected 281b59959707dfae03ce038cdf231bf4904e170c 7d5b04290156c3fc316eecc86a4f9d201ab7d44a git Not specified
CNA Linux Linux affected 281b59959707dfae03ce038cdf231bf4904e170c 3822743dc20386d9897e999dbb990befa3a5b3f8 git Not specified
CNA Linux Linux affected 3.2 Not specified
CNA Linux Linux unaffected 3.2 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.131 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.80 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3a926957cc95899ef88529710836edadc03c71a1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-082556.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/b77de3fceafbb39f30e4ff5dc986f863d5456417 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7d5b04290156c3fc316eecc86a4f9d201ab7d44a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5ad6d994255e27a3254079dfb50ca861fc31f2d0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-019113.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/7b58c110b4e1f028eb38eec9ed3555e9be81c8b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ad1f6d608f33f59d21a3d025615d6786a6443998 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3822743dc20386d9897e999dbb990befa3a5b3f8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d787d3ae96648dc14a3b7ca8fde817177e82c1c7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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