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
CVSS Version 4.0
CVSS Version 3.x
CVSS Version 2.0
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:
NVD assessment
not yet provided.
CVSS 3.x Severity and Vector Strings:
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 Severity and Vector Strings:
NVD assessment
not yet provided.
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Weakness Enumeration
CWE-ID
CWE Name
Source
NVD-CWE-noinfo
Insufficient Information
NIST
Change History
10 change records found show changes
CVE Modified by kernel.org
7/30/2026 2:21:31 AM
Action
Type
Old Value
New Value
Added
CVSS V3.1
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVE Modified by siemens-SADP
7/14/2026 9:17:23 AM
Action
Type
Old Value
New Value
Added
Reference
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
Changed
Affected
[{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem","defaultStatus":"unknown","versions":[{"version":"0","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]}]
Record truncated, showing 2048 of 2074 characters.
View Entire Change Record [{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem","defaultStatus":"unknown","versions":[{"version":"0","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","lessThan":"*","versionType":"custo
CVE Modified by siemens-SADP
6/17/2026 4:44:17 AM
Action
Type
Old Value
New Value
Added
Affected
[{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem","defaultStatus":"unknown","versions":[{"version":"0","lessThan":"*","versionType":"custom","status":"affected"}]},{"vendor":"Siemens","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","lessThan":"*","versionType":"custom","status":"affected"}]}]
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.
CVE Modified by siemens-SADP
5/12/2026 9:16:36 AM
Action
Type
Old Value
New Value
Added
Reference
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
Added
Reference
https://cert-portal.siemens.com/productcert/html/ssa-265688.html
CVE Modified by CVE
11/03/2025 4:19:10 PM
Action
Type
Old Value
New Value
Added
Reference
https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
CVE Modified by CVE
11/03/2025 3:17:19 PM
Action
Type
Old Value
New Value
Added
Reference
https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
Initial Analysis by NIST
10/28/2025 4:39:50 PM
Action
Type
Old Value
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
CVE Modified by kernel.org
3/13/2025 9:15:55 AM
Action
Type
Old Value
New Value
Added
Reference
https://git.kernel.org/stable/c/abed68027ea3ab893ac85cc46a00e2e64a324239
Added
Reference
https://git.kernel.org/stable/c/efa8a261c575f816c7e79a87aeb3ef8a0bd6b221
New CVE Received from kernel.org
2/26/2025 10:15:20 PM
Action
Type
Old Value
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: 07/30/2026
Source: kernel.org
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