01 Record

CVE-2025-21995

drm/sched: Fix fence reference count leak

MediumPUBLISHEDCNA: Linux

CNA base score5.5 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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02 Description

drm/sched: Fix fence reference count leak

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.19% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 8.8% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2025-04-03 07:18Z1 YR AGO

Last updated

2026-05-11 21:10Z5 MO AGO

Reserved

2024-12-29

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Medium (CVSS 5.5)

CNA CVSS vector

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

Weaknesses

CWE-401Missing Release of Memory after Effective LifetimeVariant

Data version

5.2

Document digest

d703445df30ede1c8d2171f21a780f0536415684a821f812fa99f1c48303813a

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux2fdb8a8f07c2f1353770a324fd19b8114e4329ac to < c76bd3c99293834de7d1dca5de536616d5655e38, 2fdb8a8f07c2f1353770a324fd19b8114e4329ac to < 1135a9431160575466ea9ac37ebd756ecbe35fff, 2fdb8a8f07c2f1353770a324fd19b8114e4329ac to < 35399c84dcedd6d31448fb9e1336ef52673f2882, 2fdb8a8f07c2f1353770a324fd19b8114e4329ac to < a952f1ab696873be124e31ce5ef964d36bce817f, 6.2—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/c76bd3c99293834de7d1dca5de536616d5655e38
git.kernel.orghttps://git.kernel.org/stable/c/1135a9431160575466ea9ac37ebd756ecbe35fff
git.kernel.orghttps://git.kernel.org/stable/c/35399c84dcedd6d31448fb9e1336ef52673f2882
git.kernel.orghttps://git.kernel.org/stable/c/a952f1ab696873be124e31ce5ef964d36bce817f

07 Fixed in

Debian 13

linux
Fixed in 6.12.21-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 6.12.21-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.