What is CVE-2025-39933?

CVE-2025-39933 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 4.16 onward and patched in 6.16.9 and 6.17. CVE-2025-39933 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-39933?

CVE-2025-39933 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-2025-39933?

Yes, CVE-2025-39933 has been patched. Fixed versions include 6.16.9 and 6.17. If you are running Linux kernel 4.16 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-39933 actively exploited?

CVE-2025-39933 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-39933

Medium

In the Linux kernel, the following vulnerability has been resolved: smb: client: let recv_done verify data_offset, data_length and remaining_data_length This is inspired by the related server fixes.

Package Linux Kernel

Published 2025-10-04

Last modified 2026-03-25

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 4.16 and later are affected. Fixed in 6.16.9, 6.17 and their respective stable series.

Affected from

≥ 4.16

Fixed in

✓ 6.16.9 6.16.x ✓ 6.17

References

The following references provide additional information about CVE-2025-39933 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/581fb78e0388b78911b0c920e4073737090c8b5f
Patch
Kernel patch commit
https://git.kernel.org/stable/c/f57e53ea252363234f86674db475839e5b87102e
Patch

Details

CVE ID CVE-2025-39933

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-10-04

Modified 2026-03-25

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-39933?

CVE-2025-39933 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 4.16 onward and has been patched in 6.16.9 and 6.17. CVE-2025-39933 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-39933?

CVE-2025-39933 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-2025-39933?

Yes — CVE-2025-39933 has been patched. Fixed versions include 6.16.9 and 6.17. If you are running Linux kernel 4.16 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-39933 actively exploited?

No — CVE-2025-39933 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.