356 lines
17 KiB
JSON
356 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveId": "CVE-2021-47168",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-03-25T09:12:14.111Z",
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"datePublished": "2024-03-25T09:16:20.778Z",
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"dateUpdated": "2026-08-05T08:46:28.312Z"
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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\nNFS: fix an incorrect limit in filelayout_decode_layout()\n\nThe \"sizeof(struct nfs_fh)\" is two bytes too large and could lead to\nmemory corruption. It should be NFS_MAXFHSIZE because that's the size\nof the ->data[] buffer.\n\nI reversed the size of the arguments to put the variable on the left."
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"value": "AV:N - The bug is reached when the NFSv4.1 pNFS filelayout client parses a LAYOUTGET layout blob from a remote metadata server over NFS/RPC; a malicious or compromised MDS (or MITM) delivers the oversized filehandle over the network.\nAC:L - The attacker fully controls the LAYOUTGET XDR and can set fh size to 129–130 to pass the incorrect sizeof check and deterministically overflow; no race or special victim-side memory layout is required.\nPR:N - Exploitation requires no privileges on the victim client—the attacker only needs to be (or impersonate) the NFS metadata server sending protocol responses after a normal pNFS mount/session.\nUI:N - In the highest-impact deployment—an already-mounted enterprise/HPC/cloud pNFS share (fstab/autofs)—routine file I/O or LAYOUTGET-on-OPEN triggers the decode path with no further interactive victim action.\nS:U - The heap overflow corrupts memory only within the client kernel’s security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - This is attacker-controlled heap memory corruption (OOB write of up to two bytes past the allocated nfs_fh, with oversized fh->size reused on later encode/copy paths), which can be leveraged for kernel information disclosure.\nI:H - The out-of-bounds write into the heap-allocated nfs_fh object is memory corruption suitable for adjacent-object/control-flow primitives; the same class of 1–2 byte NFS fh overflow (CVE-2021-4157) was assessed as privilege-escalation capable.\nA:H - Heap corruption in kernel context can cause oops/panic (and is reliably fatal under KASAN/debug allocators), fully denying availability of the client host."
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