What is CVE-2025-21967?

CVE-2025-21967 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 onward and patched in 6.6.84, 6.12.20, 6.13.8 and others. CVE-2025-21967 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-21967?

CVE-2025-21967 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-2025-21967?

Yes, CVE-2025-21967 has been patched. Fixed versions include 6.6.84, 6.12.20, 6.13.8 and others. If you are running Linux kernel 5.15 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-21967 actively exploited?

CVE-2025-21967 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-2025-21967

High

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in ksmbd_free_work_struct ->interim_entry of ksmbd_work could be deleted after oplock is freed. We don't need to manage it with linked list. The interim request could be immediately sent whenever a oplock break wait is needed.

Package Linux Kernel

Published 2025-04-01

Last modified 2025-04-16

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-2025-21967 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 and later are affected. Fixed in 6.6.84, 6.12.20, 6.13.8, 6.14 and their respective stable series.

Affected from

≥ 5.15

Fixed in

✓ 6.6.84 6.6.x ✓ 6.12.20 6.12.x ✓ 6.13.8 6.13.x ✓ 6.14

References

4 total

Kernel Git
https://git.kernel.org/stable/c/62746ae3f5414244a96293e3b017be637b641280

Patch
Kernel Git
https://git.kernel.org/stable/c/bb39ed47065455604729404729d9116868638d31

Patch
Kernel Git
https://git.kernel.org/stable/c/eb51f6f59d19b92f6fe84d3873f958495ab32f0a

Patch
Kernel Git
https://git.kernel.org/stable/c/fb776765bfc21d5e4ed03bb3d4406c2b86ff1ac3

Patch

Details

CVE ID CVE-2025-21967

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2025-04-01

Modified 2025-04-16

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-21967?

CVE-2025-21967 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 onward and has been patched in 6.6.84, 6.12.20, 6.13.8 and others. CVE-2025-21967 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-21967?

CVE-2025-21967 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-2025-21967?

Yes. CVE-2025-21967 has been patched. Fixed versions include 6.6.84, 6.12.20, 6.13.8 and others. If you are running Linux kernel 5.15 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-21967 actively exploited?

No. CVE-2025-21967 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.