What is CVE-2025-21995?

CVE-2025-21995 is a medium-severity vulnerability in Linux. CVSS score: 5.5/10. Published 2025-04-03.

How severe is CVE-2025-21995?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2025-21995 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Linux

CVE-2025-21995

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]

Published 2025-04-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (7.7th percentile), scored 2026-10-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 7.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Linux — versions 2fdb8a8f07c2f1353770a324fd19b8114e4329ac, 6.2, 0
Linux Kernel — versions 6.14

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)

Frequently asked questions

What is CVE-2025-21995?: CVE-2025-21995 is a medium-severity vulnerability in Linux. CVSS score: 5.5/10. Published 2025-04-03.
How severe is CVE-2025-21995?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2025-21995 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.