CVE-2025-38231 (GCVE-0-2025-38231)
Vulnerability from cvelistv5 – Published: 2025-07-04 13:37 – Updated: 2026-11-05 20:52
VLAI
EPSS
VEX
Title
nfsd: Initialize ssc before laundromat_work to prevent NULL dereference
Summary
In the Linux kernel, the following vulnerability has been resolved:
nfsd: Initialize ssc before laundromat_work to prevent NULL dereference
In nfs4_state_start_net(), laundromat_work may access nfsd_ssc through
nfs4_laundromat -> nfsd4_ssc_expire_umount. If nfsd_ssc isn't initialized,
this can cause NULL pointer dereference.
Normally the delayed start of laundromat_work allows sufficient time for
nfsd_ssc initialization to complete. However, when the kernel waits too
long for userspace responses (e.g. in nfs4_state_start_net ->
nfsd4_end_grace -> nfsd4_record_grace_done -> nfsd4_cld_grace_done ->
cld_pipe_upcall -> __cld_pipe_upcall -> wait_for_completion path), the
delayed work may start before nfsd_ssc initialization finishes.
Fix this by moving nfsd_ssc initialization before starting laundromat_work.
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-05 20:51 UTC
Assigner
References
10 references
Impacted products
5 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
a4bc287943f5695209ff36bdc89f17b48d68fae7 , < deaeb74ae9318252829c59a84a7d2316fc335660
(git)
Affected: f4e44b393389c77958f7c58bf4415032b4cda15b , < 0fccf5f01ed28725cc313a66ca1247eef911d55e (git) Affected: f4e44b393389c77958f7c58bf4415032b4cda15b , < a97668ec6d73dab237cd1c15efe012a10090a4ed (git) Affected: f4e44b393389c77958f7c58bf4415032b4cda15b , < 5060e1a5fef184bd11d298e3f0ee920d96a23236 (git) Affected: f4e44b393389c77958f7c58bf4415032b4cda15b , < d622c2ee6c08147ab8c9b9e37d93b6e95d3258e0 (git) Affected: f4e44b393389c77958f7c58bf4415032b4cda15b , < 83ac1ba8ca102ab5c0ed4351f8ac6e74ac4d5d64 (git) Affected: f4e44b393389c77958f7c58bf4415032b4cda15b , < b31da62889e6d610114d81dc7a6edbcaa503fcf8 (git) Affected: 5.10.220 , < 5.10.239 (semver) |
guessed | |
| Linux | Linux |
Affected:
5.14
Unaffected: 0 , < 5.14 (semver) Unaffected: 5.10.239 , ≤ 5.10.* (semver) Unaffected: 5.15.186 , ≤ 5.15.* (semver) Unaffected: 6.1.142 , ≤ 6.1.* (semver) Unaffected: 6.6.95 , ≤ 6.6.* (semver) Unaffected: 6.12.35 , ≤ 6.12.* (semver) Unaffected: 6.15.4 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (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 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: Initialize ssc before laundromat_work to prevent NULL dereference\n\nIn nfs4_state_start_net(), laundromat_work may access nfsd_ssc through\nnfs4_laundromat -\u003e nfsd4_ssc_expire_umount. If nfsd_ssc isn\u0027t initialized,\nthis can cause NULL pointer dereference.\n\nNormally the delayed start of laundromat_work allows sufficient time for\nnfsd_ssc initialization to complete. However, when the kernel waits too\nlong for userspace responses (e.g. in nfs4_state_start_net -\u003e\nnfsd4_end_grace -\u003e nfsd4_record_grace_done -\u003e nfsd4_cld_grace_done -\u003e\ncld_pipe_upcall -\u003e __cld_pipe_upcall -\u003e wait_for_completion path), the\ndelayed work may start before nfsd_ssc initialization finishes.\n\nFix this by moving nfsd_ssc initialization before starting laundromat_work."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nfsd: Inicializar ssc antes de laundromat_work para evitar la desreferencia de punteros NULL. En nfs4_state_start_net(), laundromat_work puede acceder a nfsd_ssc a trav\u00e9s de nfs4_laundromat -\u0026gt; nfsd4_ssc_expire_umount. Si nfsd_ssc no se inicializa, esto puede causar la desreferencia de punteros NULL. Normalmente, el inicio retrasado de laundromat_work permite que la inicializaci\u00f3n de nfsd_ssc se complete con tiempo suficiente. Sin embargo, cuando el n\u00facleo espera demasiado tiempo las respuestas del espacio de usuario (p. ej., en la ruta nfs4_state_start_net -\u0026gt; nfsd4_end_grace -\u0026gt; nfsd4_record_grace_done -\u0026gt; nfsd4_cld_grace_done -\u0026gt; cld_pipe_upcall -\u0026gt; __cld_pipe_upcall -\u0026gt; wait_for_completion), el trabajo retrasado puede comenzar antes de que finalice la inicializaci\u00f3n de nfsd_ssc. Para solucionar esto, mueva la inicializaci\u00f3n de nfsd_ssc antes de iniciar laundromat_work."
}
],
"id": "CVE-2025-38231",
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"product_status:known_affected": "110",
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"source": "Red Hat CSAF VEX",
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"title": "kernel: nfsd: Initialize ssc before laundromat_work to prevent NULL dereference",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38231.json",
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}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.