196 lines
10 KiB
JSON
196 lines
10 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-2023-52909",
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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": "2024-08-21T06:07:11.015Z",
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"datePublished": "2024-08-21T06:10:50.303Z",
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"dateUpdated": "2026-08-05T09:11:55.987Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T09:11:55.987Z"
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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 handling of cached open files in nfsd4_open codepath\n\nCommit fb70bf124b05 (\"NFSD: Instantiate a struct file when creating a\nregular NFSv4 file\") added the ability to cache an open fd over a\ncompound. There are a couple of problems with the way this currently\nworks:\n\nIt's racy, as a newly-created nfsd_file can end up with its PENDING bit\ncleared while the nf is hashed, and the nf_file pointer is still zeroed\nout. Other tasks can find it in this state and they expect to see a\nvalid nf_file, and can oops if nf_file is NULL.\n\nAlso, there is no guarantee that we'll end up creating a new nfsd_file\nif one is already in the hash. If an extant entry is in the hash with a\nvalid nf_file, nfs4_get_vfs_file will clobber its nf_file pointer with\nthe value of op_file and the old nf_file will leak.\n\nFix both issues by making a new nfsd_file_acquirei_opened variant that\ntakes an optional file pointer. If one is present when this is called,\nwe'll take a new reference to it instead of trying to open the file. If\nthe nfsd_file already has a valid nf_file, we'll just ignore the\noptional file and pass the nfsd_file back as-is.\n\nAlso rework the tracepoints a bit to allow for an \"opened\" variant and\ndon't try to avoid counting acquisitions in the case where we already\nhave a cached open file."
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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:N/A:H",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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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 the NFSv4 OPEN/CREATE path (nfsd4_open → nfs4_get_vfs_file → nfsd_file_create) on the in-kernel NFS server, reachable over the network via RPC to nfsd.\nAC:L - The race is between clearing NFSD_FILE_PENDING with nf_file still NULL and the later assignment of op_filp; an attacker can drive both sides with concurrent OPEN(CREATE)/OPEN requests for the same file and credentials.\nPR:N - Typical nfsd deployments use AUTH_SYS/AUTH_NULL with IP-based exports, so a remote peer that can reach the export can establish a clientid and trigger OPEN without real authentication.\nUI:N - Exploitation requires only attacker-sent NFS compounds; no victim user action is needed.\nS:U - Impact is confined to the NFS server kernel (oops/DoS or a struct file leak); it does not cross a separate security authority such as a VM or IOMMU boundary.\nC:N - The primary failure is a NULL pointer dereference of nf_file leading to an oops; there is no information disclosure or UAF read primitive.\nI:N - The bug causes a crash and a possible nf_file pointer leak/clobber without freeing the old file, not a write primitive or control-flow hijack.\nA:H - Concurrent lookups can call file_inode(nf->nf_file) while nf_file is still NULL, causing a kernel oops and denial of service of the NFS server."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "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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"programFiles": [
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"fs/nfsd/filecache.c",
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"fs/nfsd/filecache.h",
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"fs/nfsd/nfs4state.c",
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"fs/nfsd/trace.h"
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],
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"versions": [
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{
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"version": "c20097329d2c196b818c4666c7820c1378d69d61",
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"lessThan": "45c08a752982116f3287afcd1bd9c50f4fab0c28",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "106331a12b0fa5afa6995b1f9ebb03ddcaac6915",
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"lessThan": "0b778361998d6c6356b8d2fc7ddf025fb3224654",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "fb70bf124b051d4ded4ce57511dfec6d3ebf2b43",
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"lessThan": "973acfdfe90c8a4e58ade97ff0653a498531ff2e",
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"status": "affected",
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},
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{
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"version": "fb70bf124b051d4ded4ce57511dfec6d3ebf2b43",
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"lessThan": "0b3a551fa58b4da941efeb209b3770868e2eddd7",
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/nfsd/filecache.c",
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"fs/nfsd/filecache.h",
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"fs/nfsd/nfs4state.c",
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"fs/nfsd/trace.h"
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],
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"versions": [
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{
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"version": "5.19",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.19",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.7",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.19",
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"versionEndExcluding": "6.1.7"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.19",
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]
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/45c08a752982116f3287afcd1bd9c50f4fab0c28"
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},
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{
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"url": "https://git.kernel.org/stable/c/0b778361998d6c6356b8d2fc7ddf025fb3224654"
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},
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{
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"url": "https://git.kernel.org/stable/c/973acfdfe90c8a4e58ade97ff0653a498531ff2e"
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},
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{
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"url": "https://git.kernel.org/stable/c/0b3a551fa58b4da941efeb209b3770868e2eddd7"
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}
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],
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"title": "nfsd: fix handling of cached open files in nfsd4_open codepath",
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"x_generator": {
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2023-52909",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2024-09-10T16:03:02.157963Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2024-09-12T17:33:12.921Z"
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}
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}
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}
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} |