What is CVE-2025-39973?

CVE-2025-39973 is a High severity Linux kernel vulnerability with a CVSS score of 8.8 out of 10, affecting Linux kernel versions from 3.12 onward and patched in 5.4.300, 5.10.245, 5.15.194 and others. CVE-2025-39973 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-39973?

CVE-2025-39973 has a CVSS score of 8.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Is there a patch available for CVE-2025-39973?

Yes, CVE-2025-39973 has been patched. Fixed versions include 5.4.300, 5.10.245, 5.15.194 and others. If you are running Linux kernel 3.12 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-39973 actively exploited?

CVE-2025-39973 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-39973

High

In the Linux kernel, the following vulnerability has been resolved: i40e: add validation for ring_len param The `ring_len` parameter provided by the virtual function (VF) is assigned directly to the hardware memory context (HMC) without any validation. To address this, introduce an upper boundary check for both Tx and Rx queue lengths. The maximum number of descriptors supported by the hardware is 8k-32. Additionally, enforce alignment constraints: Tx rings must be a multiple of 8, and Rx rings must be a multiple of 32.

Package Linux Kernel

Published 2025-10-15

Last modified 2026-07-30

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

8.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Affected versions

Linux kernel versions 3.12 and later are affected. Fixed in 5.4.300, 5.10.245, 5.15.194, 6.1.155, 6.6.109, 6.12.50, 6.16.10, 6.17 and their respective stable series.

Affected from

≥ 3.12

Fixed in

✓ 5.4.300 5.4.x ✓ 5.10.245 5.10.x ✓ 5.15.194 5.15.x ✓ 6.1.155 6.1.x ✓ 6.6.109 6.6.x ✓ 6.12.50 6.12.x ✓ 6.16.10 6.16.x ✓ 6.17

References

8 total

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2025-39973

Severity High

CVSS score 8.8 / 10

CVSS version 3.1

Published 2025-10-15

Modified 2026-07-30

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-39973?

CVE-2025-39973 is a High severity Linux kernel vulnerability with a CVSS score of 8.8 out of 10 . It affects Linux kernel versions from 3.12 onward and has been patched in 5.4.300, 5.10.245, 5.15.194 and others. CVE-2025-39973 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-39973?

CVE-2025-39973 has a CVSS score of 8.8 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:C/C:H/I:H/A:H.
Is there a patch available for CVE-2025-39973?

Yes. CVE-2025-39973 has been patched. Fixed versions include 5.4.300, 5.10.245, 5.15.194 and others. If you are running Linux kernel 3.12 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-39973 actively exploited?

No. CVE-2025-39973 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.