What is CVE-2026-31447?

CVE-2026-31447 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 3.2 onward and patched in 5.10.253, 5.15.203, 6.1.168 and others. CVE-2026-31447 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-31447?

CVE-2026-31447 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-31447?

Yes, CVE-2026-31447 has been patched. Fixed versions include 5.10.253, 5.15.203, 6.1.168 and others. If you are running Linux kernel 3.2 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-31447 actively exploited?

CVE-2026-31447 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-31447

High

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.

Package Linux Kernel

Published 2026-04-22

Last modified 2026-05-07

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Affected versions

Linux kernel versions 3.2 and later are affected. Fixed in 5.10.253, 5.15.203, 6.1.168, 6.6.131, 6.12.80, 6.18.21, 6.19.11, 7.0 and their respective stable series.

Affected from

≥ 3.2

Fixed in

✓ 5.10.253 5.10.x ✓ 5.15.203 5.15.x ✓ 6.1.168 6.1.x ✓ 6.6.131 6.6.x ✓ 6.12.80 6.12.x ✓ 6.18.21 6.18.x ✓ 6.19.11 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-31447 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/3822743dc20386d9897e999dbb990befa3a5b3f8
Patch
Kernel patch commit
https://git.kernel.org/stable/c/3a926957cc95899ef88529710836edadc03c71a1
Patch
Kernel patch commit
https://git.kernel.org/stable/c/5ad6d994255e27a3254079dfb50ca861fc31f2d0
Patch

8 patch commits total View all on NVD

Details

CVE ID CVE-2026-31447

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-04-22

Modified 2026-05-07

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-31447?

CVE-2026-31447 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 3.2 onward and has been patched in 5.10.253, 5.15.203, 6.1.168 and others. CVE-2026-31447 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-31447?

CVE-2026-31447 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-31447?

Yes — CVE-2026-31447 has been patched. Fixed versions include 5.10.253, 5.15.203, 6.1.168 and others. If you are running Linux kernel 3.2 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-31447 actively exploited?

No — CVE-2026-31447 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.