CVE-2026-31403 (GCVE-0-2026-31403)
Vulnerability from cvelistv5
Published
2026-04-03 15:16
Modified
2026-04-13 06:08
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 Version: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 Version: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 Version: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 Version: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 Version: 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 |
||
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"vendor": "Linux",
"versions": [
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"versionType": "semver"
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"status": "unaffected",
"version": "6.6.130",
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{
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"status": "unaffected",
"version": "6.18.20",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
{
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],
"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."
}
],
"providerMetadata": {
"dateUpdated": "2026-04-13T06:08:30.708Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/c7f406fb341d6747634b8b1fa5461656e5e56076"
},
{
"url": "https://git.kernel.org/stable/c/d1a19217995df9c7e4118f5a2820c5032fef2945"
},
{
"url": "https://git.kernel.org/stable/c/e3d77f935639e6ae4b381c80464c31df998d61f4"
},
{
"url": "https://git.kernel.org/stable/c/db4a9f99b12a7ee1c19d86c83a3b752c7effa6c6"
},
{
"url": "https://git.kernel.org/stable/c/6a8d70e2ad6aad2c345a5048edcb8168036f97d6"
},
{
"url": "https://git.kernel.org/stable/c/e7fcf179b82d3a3730fd8615da01b087cc654d0b"
}
],
"title": "NFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd",
"x_generator": {
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}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-31403",
"datePublished": "2026-04-03T15:16:06.444Z",
"dateReserved": "2026-03-09T15:48:24.086Z",
"dateUpdated": "2026-04-13T06:08:30.708Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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