CVE-2026-31447
Analyzed Analyzed - Analysis Complete
Mount Rejection Vulnerability in Linux ext4 bigalloc Feature

Publication date: 2026-04-22

Last updated on: 2026-05-07

Assigner: kernel.org

Description
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.
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Meta Information
Published
2026-04-22
Last Modified
2026-05-07
Generated
2026-06-16
AI Q&A
2026-04-22
EPSS Evaluated
2026-06-14
NVD
CVE-2026-31447
EUVD
EUVD-2026-24782
Affected Vendors & Products
Showing 12 associated CPEs
Vendor Product Version / Range
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel From 5.11 (inc) to 5.15.203 (exc)
linux linux_kernel From 5.16 (inc) to 6.1.168 (exc)
linux linux_kernel From 6.13 (inc) to 6.18.21 (exc)
linux linux_kernel From 6.19 (inc) to 6.19.11 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.131 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.80 (exc)
linux linux_kernel From 3.2 (inc) to 5.10.253 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability relates to the Linux kernel's ext4 filesystem. Specifically, it involves the bigalloc feature combined with a non-zero s_first_data_block value. The issue is that bigalloc with s_first_data_block set to a value other than zero is not supported, which could lead to problems when mounting the filesystem. The vulnerability has been resolved by rejecting the mount operation if these conditions are detected.

Impact Analysis

If a filesystem using bigalloc with s_first_data_block not equal to zero is mounted, it could cause mounting failures or unexpected behavior in the Linux kernel. This could lead to system instability or data access issues, potentially impacting system reliability and availability.

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