NVD

CVE-2025-21795 Detail

Modified After Enrichment

This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.

Description

In the Linux kernel, the following vulnerability has been resolved: NFSD: fix hang in nfsd4_shutdown_callback If nfs4_client is in courtesy state then there is no point to send the callback. This causes nfsd4_shutdown_callback to hang since cl_cb_inflight is not 0. This hang lasts about 15 minutes until TCP notifies NFSD that the connection was dropped. This patch modifies nfsd4_run_cb_work to skip the RPC call if nfs4_client is in courtesy state.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

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

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://cert-portal.siemens.com/productcert/html/ssa-082556.html	siemens-SADP
https://cert-portal.siemens.com/productcert/html/ssa-265688.html	siemens-SADP
https://git.kernel.org/stable/c/036ac2778f7b28885814c6fbc07e156ad1624d03	kernel.org	Patch
https://git.kernel.org/stable/c/23ad7797c74cd8f7f90617f1e59a8703e2b43908	kernel.org	Patch
https://git.kernel.org/stable/c/38d345f612503b850c2973e5a879f88e441b34d7	kernel.org	Patch
https://git.kernel.org/stable/c/abed68027ea3ab893ac85cc46a00e2e64a324239	kernel.org	Patch
https://git.kernel.org/stable/c/cedfbb92cf97a6bff3d25633001d9c44442ee854	kernel.org	Patch
https://git.kernel.org/stable/c/e88d2451cd42e025465d6b51fd716a47b0b3800d	kernel.org	Patch
https://git.kernel.org/stable/c/efa8a261c575f816c7e79a87aeb3ef8a0bd6b221	kernel.org	Patch
https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html	CVE
https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html	CVE

Weakness Enumeration

CWE-ID	CWE Name	Source
NVD-CWE-noinfo	Insufficient Information	NIST

Known Affected Software Configurations Switch to CPE 2.2

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Change History

8 change records found show changes

CVE Modified by kernel.org 6/17/2026 4:44:17 AM

Action

Type

Old Value

New Value

Added

Affected

Record truncated, showing 2048 of 2391 characters.
View Entire Change Record

[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["fs/nfsd/nfs4callback.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"67ef9e5fd737eab2495f2586df7e9ea30caa1b77","lessThan":"abed68027ea3ab893ac85cc46a00e2e64a324239","versionType":"git","status":"affected"},{"version":"26540b8940a2e21582afa61a6fb8af87310bac72","lessThan":"efa8a261c575f816c7e79a87aeb3ef8a0bd6b221","versionType":"git","status":"affected"},{"version":"66af25799940b26efd41ea6e648f75c41a48a2c2","lessThan":"38d345f612503b850c2973e5a879f88e441b34d7","versionType":"git","status":"affected"},{"version":"66af25799940b26efd41ea6e648f75c41a48a2c2","lessThan":"23ad7797c74cd8f7f90617f1e59a8703e2b43908","versionType":"git","status":"affected"},{"version":"66af25799940b26efd41ea6e648f75c41a48a2c2","lessThan":"cedfbb92cf97a6bff3d25633001d9c44442ee854","versionType":"git","status":"affected"},{"version":"66af25799940b26efd41ea6e648f75c41a48a2c2","lessThan":"e88d2451cd42e025465d6b51fd716a47b0b3800d","versionType":"git","status":"affected"},{"version":"66af25799940b26efd41ea6e648f75c41a48a2c2","lessThan":"036ac2778f7b28885814c6fbc07e156ad1624d03","versionType":"git","status":"affected"},{"version":"5.10.220","lessThan":"5.10.235","versionType":"semver","status":"affected"},{"version":"5.15.154","lessThan":"5.15.179","versionType":"semver","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["fs/nfsd/nfs4callback.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"5.19","status":"affected"},{"version":"0","lessThan":"5.19","versionType":"semver","status":"unaffected"},{"version":"5.10.235","lessThanOrEqual":"5.10.*","versionType":"semver","status":"unaffected"},{"version":"5.15.179","lessThanOrEqual":"5.15.*","versionType":"semver","status":"unaffected"},{"version":"6.1.129","lessThanOrEqual":"6.1.*","versionType":"semver","status":"unaffected"},{"version":"6.6.79","lessThanOrEqual":"6.

Initial Analysis by NIST 10/28/2025 4:39:50 PM

Action	Type	New Value
Added	CVSS V3.1	AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Added	CWE	NVD-CWE-noinfo
Added	CPE Configuration	OR cpe:2.3:o:linux:linux_kernel:6.14:rc1::::::* cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.13 up to (excluding) 6.13.4 cpe:2.3:o:linux:linux_kernel:6.14:rc2::::::* cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.2 up to (excluding) 6.6.79 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.7 up to (excluding) 6.12.16 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 5.19 up to (excluding) 6.1.129 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 5.10.220 up to (excluding) 5.10.235 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 5.15.154 up to (excluding) 5.15.179
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/036ac2778f7b28885814c6fbc07e156ad1624d03 Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/23ad7797c74cd8f7f90617f1e59a8703e2b43908 Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/38d345f612503b850c2973e5a879f88e441b34d7 Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/abed68027ea3ab893ac85cc46a00e2e64a324239 Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/cedfbb92cf97a6bff3d25633001d9c44442ee854 Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/e88d2451cd42e025465d6b51fd716a47b0b3800d Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/efa8a261c575f816c7e79a87aeb3ef8a0bd6b221 Types: Patch

New CVE Received from kernel.org 2/26/2025 10:15:20 PM

Action	Type	New Value
Added	Description	In the Linux kernel, the following vulnerability has been resolved: NFSD: fix hang in nfsd4_shutdown_callback If nfs4_client is in courtesy state then there is no point to send the callback. This causes nfsd4_shutdown_callback to hang since cl_cb_inflight is not 0. This hang lasts about 15 minutes until TCP notifies NFSD that the connection was dropped. This patch modifies nfsd4_run_cb_work to skip the RPC call if nfs4_client is in courtesy state.
Added	Reference	https://git.kernel.org/stable/c/036ac2778f7b28885814c6fbc07e156ad1624d03
Added	Reference	https://git.kernel.org/stable/c/23ad7797c74cd8f7f90617f1e59a8703e2b43908
Added	Reference	https://git.kernel.org/stable/c/38d345f612503b850c2973e5a879f88e441b34d7
Added	Reference	https://git.kernel.org/stable/c/cedfbb92cf97a6bff3d25633001d9c44442ee854
Added	Reference	https://git.kernel.org/stable/c/e88d2451cd42e025465d6b51fd716a47b0b3800d

Quick Info

CVE Dictionary Entry:
CVE-2025-21795
NVD Published Date:
02/26/2025
NVD Last Modified:
06/17/2026
Source:
kernel.org

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Information Technology Laboratory

National Vulnerability Database

National Vulnerability Database

CVE-2025-21795 Detail

Description

Metrics

References to Advisories, Solutions, and Tools

Weakness Enumeration

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Change History

CVE Modified by siemens-SADP 6/17/2026 4:44:17 AM

CVE Modified by kernel.org 6/17/2026 4:44:17 AM

CVE Modified by siemens-SADP 5/12/2026 9:16:36 AM

CVE Modified by CVE 11/03/2025 4:19:10 PM

CVE Modified by CVE 11/03/2025 3:17:19 PM

Initial Analysis by NIST 10/28/2025 4:39:50 PM

CVE Modified by kernel.org 3/13/2025 9:15:55 AM

New CVE Received from kernel.org 2/26/2025 10:15:20 PM

Quick Info