521 lines
24 KiB
JSON
521 lines
24 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-21795",
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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": "2024-12-29T08:45:45.767Z",
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"datePublished": "2025-02-27T02:18:31.538Z",
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"dateUpdated": "2026-11-10T12:35:04.871Z"
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},
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"dateUpdated": "2026-08-05T11:54:30.327Z"
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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: fix hang in nfsd4_shutdown_callback\n\nIf nfs4_client is in courtesy state then there is no point to send\nthe callback. This causes nfsd4_shutdown_callback to hang since\ncl_cb_inflight is not 0. This hang lasts about 15 minutes until TCP\nnotifies NFSD that the connection was dropped.\n\nThis patch modifies nfsd4_run_cb_work to skip the RPC call if\nnfs4_client is in courtesy state."
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}
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],
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{
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"lang": "en",
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"value": "AV:N - The vulnerable code is in the in-kernel NFS server (nfsd) and is reached entirely through NFSv4 protocol operations (OPEN/delegation, LOCK) from a remote network client over the wire.\nAC:L - The attacker controls both sides — obtaining a delegation then dropping its connection to become a courtesy client, and issuing the conflicting operation that forces the recall — and the recall itself deterministically triggers the expiry that hangs on the in-flight SOFTCONN RPC, so the ~15-minute hang is reliably reproducible.\nPR:N - NFS exports commonly use AUTH_SYS (no real authentication) and may be accessible to a subnet or anonymously, so an unauthenticated network client can perform the OPEN/delegation and conflicting-lock operations needed; no verified privilege is required.\nUI:N - The attacker's own NFS operations set up and trigger the hang; no action by any legitimate user or administrator is needed.\nS:U - The hang is confined to the NFS server's own kernel context and workqueues; it does not cross a security/authority boundary such as a VM or IOMMU boundary.\nC:N - The defect is a wait/hang on an in-flight callback with no memory disclosure or out-of-bounds read; no confidential information is exposed.\nI:N - No data is modified or corrupted; the bug only stalls the callback-shutdown path and involves no write primitive or state alteration.\nA:H - `nfsd4_shutdown_callback` hangs for ~15 minutes, blocking the laundromat workqueue (all lease/state/delegation/lock cleanup) and lock-conflict resolution that flushes the same queue, and the stall can be triggered repeatedly — a severe denial of service of the NFS server."
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"versions": [
|
|
{
|
|
"status": "affected",
|
|
"version": "V3.1.6",
|
|
"lessThan": "*",
|
|
"versionType": "custom"
|
|
}
|
|
],
|
|
"defaultStatus": "unknown"
|
|
},
|
|
{
|
|
"vendor": "Siemens",
|
|
"product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)",
|
|
"versions": [
|
|
{
|
|
"status": "affected",
|
|
"version": "V3.1.7",
|
|
"lessThan": "*",
|
|
"versionType": "custom"
|
|
}
|
|
],
|
|
"defaultStatus": "unknown"
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
} |