What is CVE-2025-40187?

CVE-2025-40187 is a High severity Linux kernel vulnerability with a CVSS score of 7.5 out of 10, affecting Linux kernel versions from 4.17 onward and patched in 5.4.301, 5.10.246, 5.15.195 and others. CVE-2025-40187 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-40187?

CVE-2025-40187 has a CVSS score of 7.5 out of 10, rated High severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2025-40187?

Yes, CVE-2025-40187 has been patched. Fixed versions include 5.4.301, 5.10.246, 5.15.195 and others. If you are running Linux kernel 4.17 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-40187 actively exploited?

CVE-2025-40187 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-40187

High

In the Linux kernel, the following vulnerability has been resolved: net/sctp: fix a null dereference in sctp_disposition sctp_sf_do_5_1D_ce() If new_asoc->peer.adaptation_ind=0 and sctp_ulpevent_make_authkey=0 and sctp_ulpevent_make_authkey() returns 0, then the variable ai_ev remains zero and the zero will be dereferenced in the sctp_ulpevent_free() function.

Package Linux Kernel

Published 2025-11-12

Last modified 2026-07-30

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.5

out of 10

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Affected versions

Linux kernel versions 4.17 and later are affected. Fixed in 5.4.301, 5.10.246, 5.15.195, 6.1.157, 6.6.113, 6.12.54, 6.17.4, 6.18 and their respective stable series.

Affected from

≥ 4.17

Fixed in

✓ 5.4.301 5.4.x ✓ 5.10.246 5.10.x ✓ 5.15.195 5.15.x ✓ 6.1.157 6.1.x ✓ 6.6.113 6.6.x ✓ 6.12.54 6.12.x ✓ 6.17.4 6.17.x ✓ 6.18

References

8 total

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2025-40187

Severity High

CVSS score 7.5 / 10

CVSS version 3.1

Published 2025-11-12

Modified 2026-07-30

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-40187?

CVE-2025-40187 is a High severity Linux kernel vulnerability with a CVSS score of 7.5 out of 10 . It affects Linux kernel versions from 4.17 onward and has been patched in 5.4.301, 5.10.246, 5.15.195 and others. CVE-2025-40187 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-40187?

CVE-2025-40187 has a CVSS score of 7.5 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2025-40187?

Yes. CVE-2025-40187 has been patched. Fixed versions include 5.4.301, 5.10.246, 5.15.195 and others. If you are running Linux kernel 4.17 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-40187 actively exploited?

No. CVE-2025-40187 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.