CVE-2025-21795 (GCVE-0-2025-21795)
Vulnerability from cvelistv5 – Published: 2025-02-27 02:18 – Updated: 2026-09-08 08:40
VLAI
EPSS
VEX
Title
NFSD: fix hang in nfsd4_shutdown_callback
Summary
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.
Severity
7.5 (High)
Assigner
References
12 references
Impacted products
9 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
67ef9e5fd737eab2495f2586df7e9ea30caa1b77 , < abed68027ea3ab893ac85cc46a00e2e64a324239
(git)
Affected: 26540b8940a2e21582afa61a6fb8af87310bac72 , < efa8a261c575f816c7e79a87aeb3ef8a0bd6b221 (git) Affected: 66af25799940b26efd41ea6e648f75c41a48a2c2 , < 38d345f612503b850c2973e5a879f88e441b34d7 (git) Affected: 66af25799940b26efd41ea6e648f75c41a48a2c2 , < 23ad7797c74cd8f7f90617f1e59a8703e2b43908 (git) Affected: 66af25799940b26efd41ea6e648f75c41a48a2c2 , < cedfbb92cf97a6bff3d25633001d9c44442ee854 (git) Affected: 66af25799940b26efd41ea6e648f75c41a48a2c2 , < e88d2451cd42e025465d6b51fd716a47b0b3800d (git) Affected: 66af25799940b26efd41ea6e648f75c41a48a2c2 , < 036ac2778f7b28885814c6fbc07e156ad1624d03 (git) Affected: 5.10.220 , < 5.10.235 (semver) Affected: 5.15.154 , < 5.15.179 (semver) |
guessed | |
| Linux | Linux |
Affected:
5.19
Unaffected: 0 , < 5.19 (semver) Unaffected: 5.10.235 , ≤ 5.10.* (semver) Unaffected: 5.15.179 , ≤ 5.15.* (semver) Unaffected: 6.1.129 , ≤ 6.1.* (semver) Unaffected: 6.6.79 , ≤ 6.6.* (semver) Unaffected: 6.12.16 , ≤ 6.12.* (semver) Unaffected: 6.13.4 , ≤ 6.13.* (semver) Unaffected: 6.14 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed |
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"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
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"configurations": [
{
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"cveTags": [],
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: fix hang in nfsd4_shutdown_callback\n\nIf nfs4_client is in courtesy state then there is no point to send\nthe callback. This causes nfsd4_shutdown_callback to hang since\ncl_cb_inflight is not 0. This hang lasts about 15 minutes until TCP\nnotifies NFSD that the connection was dropped.\n\nThis patch modifies nfsd4_run_cb_work to skip the RPC call if\nnfs4_client is in courtesy state."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: NFSD: se corrige el bloqueo en nfsd4_shutdown_callback Si nfs4_client est\u00e1 en estado de cortes\u00eda, no tiene sentido enviar la devoluci\u00f3n de llamada. Esto hace que nfsd4_shutdown_callback se bloquee ya que cl_cb_inflight no es 0. Este bloqueo dura unos 15 minutos hasta que TCP notifica a NFSD que se interrumpi\u00f3 la conexi\u00f3n. Este parche modifica nfsd4_run_cb_work para omitir la llamada RPC si nfs4_client est\u00e1 en estado de cortes\u00eda."
}
],
"id": "CVE-2025-21795",
"lastModified": "2026-07-30T06:21:31.540",
"metrics": {
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},
{
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"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: NFSD: fix hang in nfsd4_shutdown_callback",
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"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-21795",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21795.json",
"version": "59"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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