What is CVE-2025-39965?

CVE-2025-39965 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 6.15.11 onward and patched in 6.16, 6.6.109, 6.12.50 and others. CVE-2025-39965 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-39965?

CVE-2025-39965 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2025-39965?

Yes, CVE-2025-39965 has been patched. Fixed versions include 6.16, 6.6.109, 6.12.50 and others. If you are running Linux kernel 6.15.11 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-39965 actively exploited?

CVE-2025-39965 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-39965

Medium

In the Linux kernel, the following vulnerability has been resolved: xfrm: xfrm_alloc_spi shouldn't use 0 as SPI x->id.spi == 0 means "no SPI assigned", but since commit 94f39804d891 ("xfrm: Duplicate SPI Handling"), we now create states and add them to the byspi list with this value. __xfrm_state_delete doesn't remove those states from the byspi list, since they shouldn't be there, and this shows up as a UAF the next time we go through the byspi list.

Package Linux Kernel

Published 2025-10-13

Last modified 2026-02-26

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Affected versions

Linux kernel versions 6.15.11, 6.6.103, 6.12.43, 6.16.2 and later are affected. Fixed in 6.16, 6.6.109, 6.12.50, 6.16.10 and their respective stable series.

Affected from

≥ 6.15.11 ≥ 6.6.103 ≥ 6.12.43 ≥ 6.16.2

Fixed in

✓ 6.16 6.16.x ✓ 6.6.109 6.6.x ✓ 6.12.50 6.12.x ✓ 6.16.10 6.16.x

References

4 total

Kernel Git
https://git.kernel.org/stable/c/0baf92d0b1590b903c1f4ead75e61715e50e8146

Patch
Kernel Git
https://git.kernel.org/stable/c/9fcedabaae0096f712bbb4ccca6a8538af1cd1c8

Patch
Kernel Git
https://git.kernel.org/stable/c/a78e55776522373c446f18d5002a8de4b09e6bf7

Patch
Kernel Git
https://git.kernel.org/stable/c/cd8ae32e4e4652db55bce6b9c79267d8946765a9

Patch

Details

CVE ID CVE-2025-39965

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-10-13

Modified 2026-02-26

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-39965?

CVE-2025-39965 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 6.15.11 onward and has been patched in 6.16, 6.6.109, 6.12.50 and others. CVE-2025-39965 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-39965?

CVE-2025-39965 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2025-39965?

Yes. CVE-2025-39965 has been patched. Fixed versions include 6.16, 6.6.109, 6.12.50 and others. If you are running Linux kernel 6.15.11 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-39965 actively exploited?

No. CVE-2025-39965 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.