CVE-2026-31403 (GCVE-0-2026-31403)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:16 – Updated: 2026-08-05 12:22
VLAI
Title
NFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd The /proc/fs/nfs/exports proc entry is created at module init and persists for the module's lifetime. exports_proc_open() captures the caller's current network namespace and stores its svc_export_cache in seq->private, but takes no reference on the namespace. If the namespace is subsequently torn down (e.g. container destruction after the opener does setns() to a different namespace), nfsd_net_exit() calls nfsd_export_shutdown() which frees the cache. Subsequent reads on the still-open fd dereference the freed cache_detail, walking a freed hash table. Hold a reference on the struct net for the lifetime of the open file descriptor. This prevents nfsd_net_exit() from running -- and thus prevents nfsd_export_shutdown() from freeing the cache -- while any exports fd is open. cache_detail already stores its net pointer (cd->net, set by cache_create_net()), so exports_release() can retrieve it without additional per-file storage.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 , < 76740c28050dc6db2f5550f1325b00a11bbb3255 (git)
Affected: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 , < c7f406fb341d6747634b8b1fa5461656e5e56076 (git)
Affected: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 , < d1a19217995df9c7e4118f5a2820c5032fef2945 (git)
Affected: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 , < e3d77f935639e6ae4b381c80464c31df998d61f4 (git)
Affected: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 , < db4a9f99b12a7ee1c19d86c83a3b752c7effa6c6 (git)
Affected: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 , < 6a8d70e2ad6aad2c345a5048edcb8168036f97d6 (git)
Affected: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 , < e7fcf179b82d3a3730fd8615da01b087cc654d0b (git)
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Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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    "cveId": "CVE-2026-31403",
    "datePublished": "2026-04-03T15:16:06.444Z",
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      "date": "2026-08-14",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31403\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-03T16:16:39.467\",\"lastModified\":\"2026-07-24T22:10:00.140\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nNFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd\\n\\nThe /proc/fs/nfs/exports proc entry is created at module init\\nand persists for the module\u0027s lifetime. exports_proc_open()\\ncaptures the caller\u0027s current network namespace and stores\\nits svc_export_cache in seq-\u003eprivate, but takes no reference\\non the namespace. If the namespace is subsequently torn down\\n(e.g. container destruction after the opener does setns() to a\\ndifferent namespace), nfsd_net_exit() calls nfsd_export_shutdown()\\nwhich frees the cache. Subsequent reads on the still-open fd\\ndereference the freed cache_detail, walking a freed hash table.\\n\\nHold a reference on the struct net for the lifetime of the open\\nfile descriptor. This prevents nfsd_net_exit() from running --\\nand thus prevents nfsd_export_shutdown() from freeing the cache\\n-- while any exports fd is open. cache_detail already stores\\nits net pointer (cd-\u003enet, set by cache_create_net()), so\\nexports_release() can retrieve it without additional per-file\\nstorage.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nNFSD: Mantener la referencia de red durante la vida \u00fatil del fd /proc/fs/nfs/exports\\n\\nLa entrada proc /proc/fs/nfs/exports se crea en la inicializaci\u00f3n del m\u00f3dulo y persiste durante la vida \u00fatil del m\u00f3dulo. exports_proc_open() captura el espacio de nombres de red actual del llamador y almacena su svc_export_cache en seq -\u003e private, pero no toma ninguna referencia sobre el espacio de nombres. Si el espacio de nombres se desmantela posteriormente (p. ej., destrucci\u00f3n del contenedor despu\u00e9s de que el abridor haga setns() a un espacio de nombres diferente), nfsd_net_exit() llama a nfsd_export_shutdown() que libera la cach\u00e9. Lecturas posteriores en el fd a\u00fan abierto desreferencian el cache_detail liberado, recorriendo una tabla hash liberada.\\n\\nMantener una referencia sobre la struct net durante la vida \u00fatil del descriptor de archivo abierto. Esto evita que nfsd_net_exit() se ejecute -- y por lo tanto evita que nfsd_export_shutdown() libere la cach\u00e9 -- mientras cualquier fd de exportaciones est\u00e9 abierto. cache_detail ya almacena su puntero de red (cd -\u003e net, establecido por cache_create_net()), por lo que exports_release() puede recuperarlo sin almacenamiento adicional por archivo.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/nfsd/nfsctl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5\",\"lessThan\":\"76740c28050dc6db2f5550f1325b00a11bbb3255\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5\",\"lessThan\":\"c7f406fb341d6747634b8b1fa5461656e5e56076\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5\",\"lessThan\":\"d1a19217995df9c7e4118f5a2820c5032fef2945\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5\",\"lessThan\":\"e3d77f935639e6ae4b381c80464c31df998d61f4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5\",\"lessThan\":\"db4a9f99b12a7ee1c19d86c83a3b752c7effa6c6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5\",\"lessThan\":\"6a8d70e2ad6aad2c345a5048edcb8168036f97d6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5\",\"lessThan\":\"e7fcf179b82d3a3730fd8615da01b087cc654d0b\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/nfsd/nfsctl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.253\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.167\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.130\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.78\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.20\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.10\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC 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MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"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\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.9\",\"versionEndExcluding\":\"5.10.253\",\"matchCriteriaId\":\"A73B6C7F-59A9-4C13-93DA-043EF7196D2E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"6.1.167\",\"matchCriteriaId\":\"56D62904-7C85-4BED-9EC0-3982B880F72D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.130\",\"matchCriteriaId\":\"C57BB918-DF28-46B3-94F7-144176841267\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.78\",\"matchCriteriaId\":\"28D591F5-B196-4CC9-905C-DC80F116E7A8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.20\",\"matchCriteriaId\":\"E5571059-6552-48E7-9BEF-3E358C387171\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.10\",\"matchCriteriaId\":\"96D34333-38BE-4414-9E79-6EB764329581\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"F253B622-8837-4245-BCE5-A7BF8FC76A16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F666C8D8-6538-46D4-B318-87610DE64C34\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"02259FDA-961B-47BC-AE7F-93D7EC6E90C2\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6a8d70e2ad6aad2c345a5048edcb8168036f97d6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/76740c28050dc6db2f5550f1325b00a11bbb3255\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c7f406fb341d6747634b8b1fa5461656e5e56076\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d1a19217995df9c7e4118f5a2820c5032fef2945\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/db4a9f99b12a7ee1c19d86c83a3b752c7effa6c6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e3d77f935639e6ae4b381c80464c31df998d61f4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e7fcf179b82d3a3730fd8615da01b087cc654d0b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-019113.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-082556.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T11:46:44+00:00",
      "cve": "CVE-2026-31403",
      "id": "CVE-2026-31403",
      "initial_release_date": "2026-04-03T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: NFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31403.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-19T17:41:48Z",
      "cve": "CVE-2026-31403",
      "id": "CVE-2026-31403",
      "initial_release_date": "2026-04-03T23:25:42Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "467",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "517",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31403",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31403.json",
      "version": "23"
    }
  }
}



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Taxonomy of the tags.





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.