What is CVE-2025-39929?

CVE-2025-39929 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Memory Leak flaw (CWE-401), affecting Linux kernel versions from 4.16 onward and patched in 5.10.259, 5.15.210, 6.1.154 and others. CVE-2025-39929 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-39929?

CVE-2025-39929 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-2025-39929?

Yes, CVE-2025-39929 has been patched. Fixed versions include 5.10.259, 5.15.210, 6.1.154 and others. 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-2025-39929 actively exploited?

CVE-2025-39929 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Memory Leak (CWE-401)?

The product does not release memory after use, causing gradual resource exhaustion. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/401.html

CVE-2025-39929

Medium

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix smbdirect_recv_io leak in smbd_negotiate() error path During tests of another unrelated patch I was able to trigger this error: Objects remaining on __kmem_cache_shutdown()

Package Linux Kernel

Published 2025-10-04

Last modified 2026-06-19

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

Weakness type

CWE-401

CVE-2025-39929 is a Memory Leak vulnerability

What is Memory Leak?

The product does not release memory after use, causing gradual resource exhaustion. Learn more on MITRE CWE

Affected versions

Linux kernel versions 4.16 and later are affected. Fixed in 5.10.259, 5.15.210, 6.1.154, 6.6.108, 6.12.49, 6.16.9, 6.17 and their respective stable series.

Affected from

≥ 4.16

Fixed in

✓ 5.10.259 5.10.x ✓ 5.15.210 5.15.x ✓ 6.1.154 6.1.x ✓ 6.6.108 6.6.x ✓ 6.12.49 6.12.x ✓ 6.16.9 6.16.x ✓ 6.17

References

8 total

Kernel Git
https://git.kernel.org/stable/c/0991418bf98f191d0c320bd25245fcffa1998c7e

Patch
Kernel Git
https://git.kernel.org/stable/c/3d7c075c878ac844e33c43e506c2fa27ac7e9689

Patch
Kernel Git
https://git.kernel.org/stable/c/922338efaad63cfe30d459dfc59f9d69ff93ded4

Patch
Kernel Git
https://git.kernel.org/stable/c/daac51c7032036a0ca5f1aa419ad1b0471d1c6e0

Patch
Kernel Git
https://git.kernel.org/stable/c/e7b7a93879558e77d950f1ff9a6f3daa385b33df

Patch

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2025-39929

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-10-04

Modified 2026-06-19

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-39929?

CVE-2025-39929 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a Memory Leak flaw (CWE-401) . It affects Linux kernel versions from 4.16 onward and has been patched in 5.10.259, 5.15.210, 6.1.154 and others. CVE-2025-39929 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-39929?

CVE-2025-39929 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-2025-39929?

Yes. CVE-2025-39929 has been patched. Fixed versions include 5.10.259, 5.15.210, 6.1.154 and others. 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-2025-39929 actively exploited?

No. CVE-2025-39929 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.