What is CVE-2025-39975?

CVE-2025-39975 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10, affecting Linux kernel versions from 6.6.75 onward and patched in 6.6.109, 6.12.50, 6.16.10 and others. CVE-2025-39975 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-39975?

CVE-2025-39975 has a CVSS score of 9.8 out of 10, rated Critical severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2025-39975?

Yes, CVE-2025-39975 has been patched. Fixed versions include 6.6.109, 6.12.50, 6.16.10 and others. If you are running Linux kernel 6.6.75 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-39975 actively exploited?

CVE-2025-39975 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-39975

Critical

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix wrong index reference in smb2_compound_op() In smb2_compound_op(), the loop that processes each command's response uses wrong indices when accessing response bufferes. This incorrect indexing leads to improper handling of command results. Also, if incorrectly computed index is greather than or equal to MAX_COMPOUND, it can cause out-of-bounds accesses.

Package Linux Kernel

Published 2025-10-15

Last modified 2026-07-30

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

9.8

out of 10

Critical

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Affected versions

Linux kernel versions 6.6.75, 6.12.12, 6.13.1, 6.14 and later are affected. Fixed in 6.6.109, 6.12.50, 6.16.10, 6.17 and their respective stable series.

Affected from

≥ 6.6.75 ≥ 6.12.12 ≥ 6.13.1 ≥ 6.14

Fixed in

✓ 6.6.109 6.6.x ✓ 6.12.50 6.12.x ✓ 6.16.10 6.16.x ✓ 6.17

References

4 total

Details

CVE ID CVE-2025-39975

Severity Critical

CVSS score 9.8 / 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-2025-39975?

CVE-2025-39975 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10 . It affects Linux kernel versions from 6.6.75 onward and has been patched in 6.6.109, 6.12.50, 6.16.10 and others. CVE-2025-39975 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-39975?

CVE-2025-39975 has a CVSS score of 9.8 out of 10, rated Critical severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2025-39975?

Yes. CVE-2025-39975 has been patched. Fixed versions include 6.6.109, 6.12.50, 6.16.10 and others. If you are running Linux kernel 6.6.75 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-39975 actively exploited?

No. CVE-2025-39975 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.