01 Record

CVE-2026-31447

ext4: reject mount if bigalloc with s_first_data_block != 0

HighPUBLISHEDCNA: Linux

CNA base score7.8 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

View raw JSON

02 Description

ext4: reject mount if bigalloc with s_first_data_block != 0

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 0.14% probability of exploitation activity in the next 30 days.
EPSS percentile: Ranks above 4.0% of scored records. A rank, not a probability.
NVD base score: 7.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD analysis status: Modified. NVD last modified this record on 2026-07-14.
Red Hat severity: Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-04-22 13:53Z4 MO AGO

Last updated

2026-08-05 12:22Z1 MO AGO

Reserved

2026-03-09

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

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

Weaknesses

CWE-1288Improper Validation of Consistency within InputBase

Data version

5.2

Document digest

80f019631ceab325e6a5cb9ff334ad5cf62b99fdeb93de241c4ad0fc8e7ab9b6

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux281b59959707dfae03ce038cdf231bf4904e170c to < 5ad6d994255e27a3254079dfb50ca861fc31f2d0, 281b59959707dfae03ce038cdf231bf4904e170c to < 3a926957cc95899ef88529710836edadc03c71a1, 281b59959707dfae03ce038cdf231bf4904e170c to < 7b58c110b4e1f028eb38eec9ed3555e9be81c8b0, 281b59959707dfae03ce038cdf231bf4904e170c to < b77de3fceafbb39f30e4ff5dc986f863d5456417, 281b59959707dfae03ce038cdf231bf4904e170c to < d787d3ae96648dc14a3b7ca8fde817177e82c1c7, 281b59959707dfae03ce038cdf231bf4904e170c to < ad1f6d608f33f59d21a3d025615d6786a6443998, 281b59959707dfae03ce038cdf231bf4904e170c to < 7d5b04290156c3fc316eecc86a4f9d201ab7d44a, 281b59959707dfae03ce038cdf231bf4904e170c to < 3822743dc20386d9897e999dbb990befa3a5b3f8, 3.2—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/5ad6d994255e27a3254079dfb50ca861fc31f2d0
git.kernel.orghttps://git.kernel.org/stable/c/3a926957cc95899ef88529710836edadc03c71a1
git.kernel.orghttps://git.kernel.org/stable/c/7b58c110b4e1f028eb38eec9ed3555e9be81c8b0
git.kernel.orghttps://git.kernel.org/stable/c/b77de3fceafbb39f30e4ff5dc986f863d5456417
git.kernel.orghttps://git.kernel.org/stable/c/d787d3ae96648dc14a3b7ca8fde817177e82c1c7
git.kernel.orghttps://git.kernel.org/stable/c/ad1f6d608f33f59d21a3d025615d6786a6443998
git.kernel.orghttps://git.kernel.org/stable/c/7d5b04290156c3fc316eecc86a4f9d201ab7d44a
git.kernel.orghttps://git.kernel.org/stable/c/3822743dc20386d9897e999dbb990befa3a5b3f8
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-082556.html
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-019113.html

01 Record index

CVE-2026-31447

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2026-31447

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References