What is CVE-2025-39743?

CVE-2025-39743 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 2.6.14 onward and patched in 5.4.297, 5.10.241, 5.15.190 and others. CVE-2025-39743 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-39743?

CVE-2025-39743 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:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2025-39743?

Yes, CVE-2025-39743 has been patched. Fixed versions include 5.4.297, 5.10.241, 5.15.190 and others. If you are running Linux kernel 2.6.14 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-39743 actively exploited?

CVE-2025-39743 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-39743

High

In the Linux kernel, the following vulnerability has been resolved: jfs: truncate good inode pages when hard link is 0 The fileset value of the inode copy from the disk by the reproducer is AGGR_RESERVED_I. When executing evict, its hard link number is 0, so its inode pages are not truncated. This causes the bugon to be triggered when executing clear_inode() because nrpages is greater than 0.

Package Linux Kernel

Published 2025-09-11

Last modified 2026-05-12

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

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Affected versions

Linux kernel versions 2.6.14 and later are affected. Fixed in 5.4.297, 5.10.241, 5.15.190, 6.1.149, 6.6.103, 6.12.43, 6.15.11, 6.16.2, 6.17 and their respective stable series.

Affected from

≥ 2.6.14

Fixed in

✓ 5.4.297 5.4.x ✓ 5.10.241 5.10.x ✓ 5.15.190 5.15.x ✓ 6.1.149 6.1.x ✓ 6.6.103 6.6.x ✓ 6.12.43 6.12.x ✓ 6.15.11 6.15.x ✓ 6.16.2 6.16.x ✓ 6.17

References

The following references provide additional information about CVE-2025-39743 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Debian Security
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html

Mailing List Third Party Advisory
Debian Security
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html

Mailing List Third Party Advisory
Cert-Portal
https://cert-portal.siemens.com/productcert/html/ssa-032379.html
Kernel patch commit
https://git.kernel.org/stable/c/1bb5cdc3e39f0c2b311fcb631258b7e60d3fb0d3
Patch
Kernel patch commit
https://git.kernel.org/stable/c/2b1d5ca395a5fb170c3f885cd42c16179f7f54ec
Patch
Kernel patch commit
https://git.kernel.org/stable/c/2d91b3765cd05016335cd5df5e5c6a29708ec058
Patch

9 patch commits total View all on NVD

Details

CVE ID CVE-2025-39743

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2025-09-11

Modified 2026-05-12

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-39743?

CVE-2025-39743 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 2.6.14 onward and has been patched in 5.4.297, 5.10.241, 5.15.190 and others. CVE-2025-39743 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-39743?

CVE-2025-39743 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:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2025-39743?

Yes — CVE-2025-39743 has been patched. Fixed versions include 5.4.297, 5.10.241, 5.15.190 and others. If you are running Linux kernel 2.6.14 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-39743 actively exploited?

No — CVE-2025-39743 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.