What is CVE-2025-39702?

CVE-2025-39702 is a High severity Linux kernel vulnerability with a CVSS score of 7.0 out of 10, affecting Linux kernel versions from 4.10 onward and patched in 5.10.249, 5.15.190, 6.1.149 and others. CVE-2025-39702 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-39702?

CVE-2025-39702 has a CVSS score of 7.0 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2025-39702?

Yes, CVE-2025-39702 has been patched. Fixed versions include 5.10.249, 5.15.190, 6.1.149 and others. If you are running Linux kernel 4.10 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-39702 actively exploited?

CVE-2025-39702 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-39702

High

In the Linux kernel, the following vulnerability has been resolved: ipv6: sr: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.

Package Linux Kernel

Published 2025-09-05

Last modified 2026-05-12

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.0

out of 10

High

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-203

CVE-2025-39702 is classified as CWE-203

See CWE-203 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 4.10 and later are affected. Fixed in 5.10.249, 5.15.190, 6.1.149, 6.6.103, 6.12.44, 6.16.4, 6.17 and their respective stable series.

Affected from

≥ 4.10

Fixed in

✓ 5.10.249 5.10.x ✓ 5.15.190 5.15.x ✓ 6.1.149 6.1.x ✓ 6.6.103 6.6.x ✓ 6.12.44 6.12.x ✓ 6.16.4 6.16.x ✓ 6.17

References

The following references provide additional information about CVE-2025-39702 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/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/3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0
Patch
Kernel patch commit
https://git.kernel.org/stable/c/3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3
Patch
Kernel patch commit
https://git.kernel.org/stable/c/86b6d34717fe0570afce07ee79b8eeb40341f831
Patch

7 patch commits total View all on NVD

Details

CVE ID CVE-2025-39702

Severity High

CVSS score 7.0 / 10

CVSS version 3.1

Published 2025-09-05

Modified 2026-05-12

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-39702?

CVE-2025-39702 is a High severity Linux kernel vulnerability with a CVSS score of 7.0 out of 10 . It affects Linux kernel versions from 4.10 onward and has been patched in 5.10.249, 5.15.190, 6.1.149 and others. CVE-2025-39702 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-39702?

CVE-2025-39702 has a CVSS score of 7.0 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2025-39702?

Yes — CVE-2025-39702 has been patched. Fixed versions include 5.10.249, 5.15.190, 6.1.149 and others. If you are running Linux kernel 4.10 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-39702 actively exploited?

No — CVE-2025-39702 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.