300 lines
15 KiB
JSON
300 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveId": "CVE-2022-48828",
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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": "2024-07-16T11:38:08.903Z",
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"datePublished": "2024-07-16T11:44:12.660Z",
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"dateUpdated": "2026-10-14T18:44:47.003Z"
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},
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"dateUpdated": "2026-08-05T08:52:33.198Z"
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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 ia_size underflow\n\niattr::ia_size is a loff_t, which is a signed 64-bit type. NFSv3 and\nNFSv4 both define file size as an unsigned 64-bit type. Thus there\nis a range of valid file size values an NFS client can send that is\nalready larger than Linux can handle.\n\nCurrently decode_fattr4() dumps a full u64 value into ia_size. If\nthat value happens to be larger than S64_MAX, then ia_size\nunderflows. I'm about to fix up the NFSv3 behavior as well, so let's\ncatch the underflow in the common code path: nfsd_setattr()."
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"value": "AV:N - The bug is in nfsd_setattr()/decode_fattr4 on the in-kernel NFS server; a remote NFSv4 client triggers it by sending SETATTR (or OPEN/CREATE with a size attribute) with a file size greater than S64_MAX over the network.\nAC:L - The attacker fully controls the SETATTR size field and can deterministically supply a u64 > S64_MAX; conversion to signed loff_t and the subsequent notify_change path require no race or attacker-uncontrollable conditions.\nPR:N - Typical nfsd deployments accept AUTH_SYS/AUTH_NULL on reachable exports, so a network peer can obtain a filehandle and assert a writable owner UID without verified credentials; NFSv4 size SETATTR then proceeds with a write stateid from that unauthenticated session.\nUI:N - The attacker alone mounts/looks up and issues SETATTR with an oversized size; no victim user action such as opening a crafted file is required beyond nfsd already exporting a filesystem.\nS:U - Impact is corruption of the NFS server's own kernel/filesystem state under the same OS security authority; there is no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:N - The flaw turns an oversized size into a negative ia_size and drives a destructive truncate/corruption path; it does not create an OOB/UAF read or other information-disclosure primitive.\nI:H - At the time of this bug, inode_newsize_ok() did not reject negative offsets, so notify_change applied ia_size < 0 through setattr_prepare into ext4/xfs truncate paths, writing a negative i_size/i_disksize and freeing file blocks—documented filesystem corruption.\nA:H - Corrupting inode size metadata and truncating file contents on the exported filesystem denies service for that data and can destabilize subsequent VFS/fs operations on the corrupted inode, matching High availability impact for a network-triggered server-side corruption."
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}
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