CVE-2025-21995 - Vulnerability Details

- drm/sched: Fix fence reference count leak

Description

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

Score: 5.5 Medium

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`2fdb8a8f07c2f1353770a324fd19b8114e4329ac`	affected	< c76bd3c99293834de7d1dca5de536616d5655e38
`2fdb8a8f07c2f1353770a324fd19b8114e4329ac`	affected	< 1135a9431160575466ea9ac37ebd756ecbe35fff
`2fdb8a8f07c2f1353770a324fd19b8114e4329ac`	affected	< 35399c84dcedd6d31448fb9e1336ef52673f2882
`2fdb8a8f07c2f1353770a324fd19b8114e4329ac`	affected	< a952f1ab696873be124e31ce5ef964d36bce817f

Linux

affected

Version	Status	Constraints
`6.2`	affected	—
`0`	unaffected	< 6.2
`6.6.85`	unaffected	≤ 6.6.*
`6.12.21`	unaffected	≤ 6.12.*
`6.13.9`	unaffected	≤ 6.13.*
`6.14`	unaffected	≤ *

Configuration 1 [-]

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:6.14:rc1::::::
	cpe:2.3:o:linux:linux_kernel:6.14:rc2::::::
	cpe:2.3:o:linux:linux_kernel:6.14:rc3::::::
	cpe:2.3:o:linux:linux_kernel:6.14:rc4::::::
	cpe:2.3:o:linux:linux_kernel:6.14:rc5::::::
	cpe:2.3:o:linux:linux_kernel:6.14:rc6::::::
	cpe:2.3:o:linux:linux_kernel:6.14:rc7::::::

No data.

No data available yet.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
EUVD	EUVD-2025-9601	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]
Ubuntu USN	USN-7605-1	Linux kernel vulnerabilities
Ubuntu USN	USN-7605-2	Linux kernel (Low Latency) vulnerabilities
Ubuntu USN	USN-7606-1	Linux kernel (OEM) vulnerabilities
Ubuntu USN	USN-7628-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-7764-1	Linux kernel vulnerabilities
Ubuntu USN	USN-7764-2	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-7765-1	Linux kernel (NVIDIA) vulnerabilities
Ubuntu USN	USN-7766-1	Linux kernel vulnerabilities
Ubuntu USN	USN-7767-1	Linux kernel (Real-time) vulnerabilities
Ubuntu USN	USN-7767-2	Linux kernel (Real-time) vulnerabilities
Ubuntu USN	USN-7779-1	Linux kernel (IBM) vulnerabilities
Ubuntu USN	USN-7790-1	Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN	USN-7800-1	Linux kernel (Raspberry Pi Real-time) vulnerabilities
Ubuntu USN	USN-7801-1	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-7802-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-7801-2	Linux kernel (Oracle) vulnerabilities
Ubuntu USN	USN-7809-1	Linux kernel (Azure, N-Series) vulnerabilities
Ubuntu USN	USN-7801-3	Linux kernel (Oracle) vulnerabilities

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00028.

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://git.kernel.org/stable/c/1135a9431160575466ea9ac37ebd756ecbe35fff
https://git.kernel.org/stable/c/35399c84dcedd6d31448fb9e1336ef52673f2882
https://git.kernel.org/stable/c/a952f1ab696873be124e31ce5ef964d36bce817f
https://git.kernel.org/stable/c/c76bd3c99293834de7d1dca5de536616d5655e38
https://lore.kernel.org/linux-cve-announce/2025040346-CVE-2025-21995-64c3@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2025-21995
https://www.cve.org/CVERecord?id=CVE-2025-21995

History

Wed, 01 Oct 2025 19:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Mon, 14 Apr 2025 13:00:00 +0000

Type	Values Removed	Values Added
First Time appeared		Linux Linux linux Kernel
Weaknesses		NVD-CWE-Other
CPEs		cpe:2.3:o:linux:linux_kernel:::::::: cpe:2.3:o:linux:linux_kernel:6.14:rc1:::::: cpe:2.3:o:linux:linux_kernel:6.14:rc2:::::: cpe:2.3:o:linux:linux_kernel:6.14:rc3:::::: cpe:2.3:o:linux:linux_kernel:6.14:rc4:::::: cpe:2.3:o:linux:linux_kernel:6.14:rc5:::::: cpe:2.3:o:linux:linux_kernel:6.14:rc6:::::: cpe:2.3:o:linux:linux_kernel:6.14:rc7::::::
Vendors & Products		Linux Linux linux Kernel
Metrics	cvssV3_1 `{'score': 6.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L'}`	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}`

Thu, 10 Apr 2025 15:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-401
Metrics	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}`	cvssV3_1 `{'score': 6.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L'}`

Fri, 04 Apr 2025 02:15:00 +0000

Type	Values Removed	Values Added
References		https://lore.kernel.org/linux-cve-announce/2025040346-CVE-2025-21995-64c3@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2025-21995 https://www.cve.org/CVERecord?id=CVE-2025-21995
Metrics	threat_severity `None`	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}` threat_severity `Low`

Thu, 03 Apr 2025 07:30:00 +0000

Type	Values Removed	Values Added
Description		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]
Title		drm/sched: Fix fence reference count leak
References		https://git.kernel.org/stable/c/1135a9431160575466ea9ac37ebd756ecbe35fff https://git.kernel.org/stable/c/35399c84dcedd6d31448fb9e1336ef52673f2882 https://git.kernel.org/stable/c/a952f1ab696873be124e31ce5ef964d36bce817f https://git.kernel.org/stable/c/c76bd3c99293834de7d1dca5de536616d5655e38

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-04-03T07:18:59.178Z

Updated: 2026-05-11T21:10:36.364Z

Reserved: 2024-12-29T08:45:45.801Z

Link: CVE-2025-21995

Vulnrichment

Updated: 2025-10-01T14:39:09.370Z

NVD

Status : Modified

Published: 2025-04-03T08:15:14.870

Modified: 2025-10-01T19:15:34.783

Link: CVE-2025-21995

Redhat

Severity : Low

Publid Date: 2025-04-03T00:00:00Z

Links: CVE-2025-21995 - Bugzilla

OpenCVE Enrichment

No data.

Weaknesses

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Exploitation none

Automatable no

Technical Impact partial

Subscriptions

JSON object

JSON object

JSON object

JSON object

JSON object