What is CVE-2025-68817?

CVE-2025-68817 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Use After Free flaw (CWE-416), affecting Linux kernel versions from 5.15.145 onward and patched in 5.15.199, 6.1.160, 6.6.120 and others. CVE-2025-68817 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-68817?

CVE-2025-68817 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2025-68817?

Yes, CVE-2025-68817 has been patched. Fixed versions include 5.15.199, 6.1.160, 6.6.120 and others. If you are running Linux kernel 5.15.145 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-68817 actively exploited?

CVE-2025-68817 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/416.html

CVE-2025-68817

High

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency Under high concurrency, A tree-connection object (tcon) is freed on a disconnect path while another path still holds a reference and later executes *_put()/write on it.

Package Linux Kernel

Published 2026-01-13

Last modified 2026-02-26

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-416

CVE-2025-68817 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.15.145, 6.1.71, 6.6 and later are affected. Fixed in 5.15.199, 6.1.160, 6.6.120, 6.12.64, 6.18.3, 6.19 and their respective stable series.

Affected from

≥ 5.15.145 ≥ 6.1.71 ≥ 6.6

Fixed in

✓ 5.15.199 5.15.x ✓ 6.1.160 6.1.x ✓ 6.6.120 6.6.x ✓ 6.12.64 6.12.x ✓ 6.18.3 6.18.x ✓ 6.19

References

6 total

Kernel Git
https://git.kernel.org/stable/c/063cbbc6f595ea36ad146e1b7d2af820894beb21

Patch
Kernel Git
https://git.kernel.org/stable/c/21a3d01fc6db5129f81edb0ab7cb94fd758bcbea

Patch
Kernel Git
https://git.kernel.org/stable/c/446beed646b2e426dd53d27358365f8678e1dd01

Patch
Kernel Git
https://git.kernel.org/stable/c/b39a1833cc4a2755b02603eec3a71a85e9dff926

Patch
Kernel Git
https://git.kernel.org/stable/c/d092de8a26c952379ded8e6b0bda31d89befac1a

Patch

Showing 5 of 6 references View all on NVD

Details

CVE ID CVE-2025-68817

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-01-13

Modified 2026-02-26

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-68817?

CVE-2025-68817 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Use After Free flaw (CWE-416) . It affects Linux kernel versions from 5.15.145 onward and has been patched in 5.15.199, 6.1.160, 6.6.120 and others. CVE-2025-68817 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-68817?

CVE-2025-68817 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2025-68817?

Yes. CVE-2025-68817 has been patched. Fixed versions include 5.15.199, 6.1.160, 6.6.120 and others. If you are running Linux kernel 5.15.145 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-68817 actively exploited?

No. CVE-2025-68817 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.