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CVE-2025-38231 (GCVE-0-2025-38231)

Vulnerability from cvelistv5 – Published: 2025-07-04 13:37 – Updated: 2026-07-14 12:41
VLAI
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted 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 Create a notification for this product.
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 Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
guessed Create a notification for this product.
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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. 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T00:56:32+00:00",
      "cve": "CVE-2025-38231",
      "id": "CVE-2025-38231",
      "initial_release_date": "2025-07-04T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "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",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-30T01:56:07Z",
      "cve": "CVE-2025-38231",
      "id": "CVE-2025-38231",
      "initial_release_date": "2025-07-07T23:23:32Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "537",
      "product_status:known_not_affected": "299",
      "product_status:recommended": "472",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38231",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38231.json",
      "version": "45"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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.