What is CVE-2025-21995?

CVE-2025-21995 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 6.2 onward and patched in 6.6.85, 6.12.21, 6.13.9 and others. CVE-2025-21995 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-21995?

CVE-2025-21995 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-2025-21995?

Yes, CVE-2025-21995 has been patched. Fixed versions include 6.6.85, 6.12.21, 6.13.9 and others. If you are running Linux kernel 6.2 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-21995 actively exploited?

CVE-2025-21995 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-21995

Medium

In the Linux kernel, the following vulnerability has been resolved: drm/sched: Fix fence reference count leak The last_scheduled fence leaks when an entity is being killed and adding the cleanup callback fails. Decrement the reference count of prev when dma_fence_add_callback() fails, ensuring proper balance. [phasta: add git tag info for stable kernel]

Package Linux Kernel

Published 2025-04-03

Last modified 2025-10-01

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 6.2 and later are affected. Fixed in 6.6.85, 6.12.21, 6.13.9, 6.14 and their respective stable series.

Affected from

≥ 6.2

Fixed in

✓ 6.6.85 6.6.x ✓ 6.12.21 6.12.x ✓ 6.13.9 6.13.x ✓ 6.14

References

The following references provide additional information about CVE-2025-21995 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/1135a9431160575466ea9ac37ebd756ecbe35fff
Patch
Kernel patch commit
https://git.kernel.org/stable/c/35399c84dcedd6d31448fb9e1336ef52673f2882
Patch
Kernel patch commit
https://git.kernel.org/stable/c/a952f1ab696873be124e31ce5ef964d36bce817f
Patch

4 patch commits total View all on NVD

Details

CVE ID CVE-2025-21995

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-04-03

Modified 2025-10-01

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-21995?

CVE-2025-21995 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 6.2 onward and has been patched in 6.6.85, 6.12.21, 6.13.9 and others. CVE-2025-21995 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-21995?

CVE-2025-21995 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-2025-21995?

Yes — CVE-2025-21995 has been patched. Fixed versions include 6.6.85, 6.12.21, 6.13.9 and others. If you are running Linux kernel 6.2 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-21995 actively exploited?

No — CVE-2025-21995 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.