505 lines
24 KiB
JSON
505 lines
24 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveId": "CVE-2026-31403",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-03-09T15:48:24.086Z",
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"datePublished": "2026-04-03T15:16:06.444Z",
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"dateUpdated": "2026-11-10T12:43:55.251Z"
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"dateUpdated": "2026-08-05T12:22:11.457Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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's lifetime. exports_proc_open()\ncaptures the caller's current network namespace and stores\nits svc_export_cache in seq->private, 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->net, set by cache_create_net()), so\nexports_release() can retrieve it without additional per-file\nstorage."
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"baseScore": 7.8,
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},
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{
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"lang": "en",
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"value": "AV:L - The vulnerable path is reached by locally opening and reading `/proc/fs/nfs/exports`; remote NFS protocol traffic does not invoke this proc seq_file path.\nAC:L - The attacker controls the needed sequence: open the proc file in a network namespace, let that namespace be torn down, then read the still-open fd. No uncontrollable race or special timing is required.\nPR:L - The proc entry is world-readable, and a basic unprivileged local user can plausibly create a temporary network namespace via user namespaces to trigger the lifetime bug. It does not require real root in the initial namespace or NFSD administrator privileges.\nUI:N - No victim action is required; the attacker can open, transfer or retain, and read the file descriptor themselves.\nS:U - The impact remains within the kernel and its local host security authority. This is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - This is a use-after-free of `cache_detail` and its freed hash table during seq_file iteration. The dangling heap objects can be reused and dereferenced, making high confidentiality impact defensible.\nI:H - As a kernel heap use-after-free, reused object contents can potentially be shaped into memory corruption or control-flow primitives. Following the higher-severity rule for UAFs, integrity impact is High.\nA:H - Reading the stale fd dereferences freed kernel memory and can oops or panic the kernel. The attacker can trigger this repeatedly once the namespace teardown condition is created."
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"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "total"
|
|
}
|
|
],
|
|
"version": "2.0.3",
|
|
"timestamp": "2026-10-16T15:08:54.794541Z"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"problemTypes": [
|
|
{
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"type": "CWE",
|
|
"cweId": "CWE-416",
|
|
"description": "CWE-416 Use After Free"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2026-10-19T18:35:46.952Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |