300 lines
15 KiB
JSON
300 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2022-48829",
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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": "2024-07-16T11:44:13.313Z",
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"dateUpdated": "2026-10-14T18:44:53.923Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:52:34.299Z"
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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 NFSv3 SETATTR/CREATE's handling of large file sizes\n\niattr::ia_size is a loff_t, so these NFSv3 procedures must be\ncareful to deal with incoming client size values that are larger\nthan s64_max without corrupting the value.\n\nSilently capping the value results in storing a different value\nthan the client passed in which is unexpected behavior, so remove\nthe min_t() check in decode_sattr3().\n\nNote that RFC 1813 permits only the WRITE procedure to return\nNFS3ERR_FBIG. We believe that NFSv3 reference implementations\nalso return NFS3ERR_FBIG when ia_size is too large."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
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"baseScore": 9.1,
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"baseSeverity": "CRITICAL"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - The bug is in NFSD's NFSv3 XDR decode path (decode_sattr3) used by SETATTR and CREATE on the in-kernel NFS server; a remote client triggers it by sending an NFSv3 SETATTR/CREATE with a file size larger than S64_MAX over the network.\nAC:L - The attacker fully controls the sattr3 size field and can deterministically supply any u64 greater than S64_MAX; the silent min_t() capping and subsequent nfsd_setattr/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 UID without verified credentials; NFSv3 SETATTR/CREATE with ATTR_SIZE then proceeds under those unauthenticated credentials.\nUI:N - The attacker alone mounts/looks up and issues SETATTR or CREATE with an oversized size; no victim user action is required beyond nfsd already exporting a writable filesystem.\nS:U - Impact is confined to 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 silently substitutes NFS_OFFSET_MAX for an oversized client size and applies that via setattr; it does not create an OOB/UAF read or other information-disclosure primitive.\nI:H - Silently capping oversized sizes to NFS_OFFSET_MAX causes nfsd to apply a maximum file size on filesystems whose s_maxbytes allows it (e.g. XFS with MAX_LFS_FILESIZE), corrupting the file's size attribute relative to the protocol's reject-oversized policy; when uncertain versus Low, High is required.\nA:H - Applying a S64_MAX file size via SETATTR/CREATE enables enormous sparse files and edge-case VFS/filesystem behavior at OFFSET_MAX that can deny service for the exported data and destabilize subsequent operations on that inode; when uncertain versus Low, High is required."
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}
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]
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}
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"product": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"version": "0",
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"version": "5.16.10",
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