What is CVE-2025-38403?

CVE-2025-38403 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 3.9 onward and patched in 5.4.296, 5.10.240, 5.15.187 and others. CVE-2025-38403 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-38403?

CVE-2025-38403 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-2025-38403?

Yes, CVE-2025-38403 has been patched. Fixed versions include 5.4.296, 5.10.240, 5.15.187 and others. If you are running Linux kernel 3.9 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-38403 actively exploited?

CVE-2025-38403 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-38403

High

In the Linux kernel, the following vulnerability has been resolved: vsock/vmci: Clear the vmci transport packet properly when initializing it In vmci_transport_packet_init memset the vmci_transport_packet before populating the fields to avoid any uninitialised data being left in the structure.

Package Linux Kernel

Published 2025-07-25

Last modified 2025-12-23

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 3.9 and later are affected. Fixed in 5.4.296, 5.10.240, 5.15.187, 6.1.144, 6.6.97, 6.12.37, 6.15.6, 6.16 and their respective stable series.

Affected from

≥ 3.9

Fixed in

✓ 5.4.296 5.4.x ✓ 5.10.240 5.10.x ✓ 5.15.187 5.15.x ✓ 6.1.144 6.1.x ✓ 6.6.97 6.6.x ✓ 6.12.37 6.12.x ✓ 6.15.6 6.15.x ✓ 6.16

References

The following references provide additional information about CVE-2025-38403 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

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

Third Party Advisory
Kernel patch commit
https://git.kernel.org/stable/c/0a01021317375b8d1895152f544421ce49299eb1
Patch
Kernel patch commit
https://git.kernel.org/stable/c/19c2cc01ff9a8031398a802676ffb0f4692dd95d
Patch
Kernel patch commit
https://git.kernel.org/stable/c/1c1bcb0e78230f533b4103e8cf271d17c3f469f0
Patch

8 patch commits total View all on NVD

Details

CVE ID CVE-2025-38403

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2025-07-25

Modified 2025-12-23

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-38403?

CVE-2025-38403 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 3.9 onward and has been patched in 5.4.296, 5.10.240, 5.15.187 and others. CVE-2025-38403 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-38403?

CVE-2025-38403 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-2025-38403?

Yes — CVE-2025-38403 has been patched. Fixed versions include 5.4.296, 5.10.240, 5.15.187 and others. If you are running Linux kernel 3.9 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-38403 actively exploited?

No — CVE-2025-38403 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.