222 lines
12 KiB
JSON
222 lines
12 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-2023-53867",
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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": "2025-12-09T01:27:17.829Z",
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"datePublished": "2025-12-24T10:55:25.430Z",
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"dateUpdated": "2026-10-15T21:41:37.567Z"
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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": "2026-08-05T09:16:28.667Z"
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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\nceph: fix potential use-after-free bug when trimming caps\n\nWhen trimming the caps and just after the 'session->s_cap_lock' is\nreleased in ceph_iterate_session_caps() the cap maybe removed by\nanother thread, and when using the stale cap memory in the callbacks\nit will trigger use-after-free crash.\n\nWe need to check the existence of the cap just after the 'ci->i_ceph_lock'\nbeing acquired. And do nothing if it's already removed."
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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:H/I:H/A:H",
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"baseScore": 9.8,
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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 - Every caller of the vulnerable `ceph_iterate_session_caps()` is driven by a message received from the remote Ceph MDS over TCP — `CEPH_SESSION_RECALL_STATE` (trim), `CLOSE`/`REJECT` (remove_session_caps), `STALE` (renewcaps) and MDS reconnect — processed in `handle_session()` on the messenger workqueue. A malicious, compromised, or on-path-spoofed MDS reaches the code purely with network traffic.\nAC:L - The attacker drives both sides of the race: `RECALL_STATE`/session-close/reconnect storms start the cap iteration while concurrent cap-revoke/export/session messages and the callback's own `d_prune_aliases()`/inode-eviction path remove caps. The window spans sleeping operations (`d_find_primary()`, `ceph_mdsc_build_path()`, dentry pruning) and can be retried indefinitely, so it is reliably hit.\nPR:N - No credentials or privileges on the victim client are required — the malicious MDS peer needs no local authority, and the code runs unauthenticated with respect to the client's privilege model. Locally, mere unprivileged access to a mounted CephFS is enough to generate the concurrent cap churn.\nUI:N - Exploitation needs no victim action beyond an already-mounted CephFS, which is the normal operating state of an affected system; the MDS drives the whole sequence on its own.\nS:U - The stale `struct ceph_cap` corruption and the resulting oops are confined to the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The use-after-free gives a read primitive over freed/recycled `ceph_cap` slab memory, and `reconnect_caps_cb()` encodes those stale fields (`cap->cap_id`, `cap->issued`) directly into the reconnect message transmitted to the MDS, exfiltrating freed-object contents to the attacker.\nI:H - The callbacks write into the stale object — `cap->seq/issue_seq/mseq/cap_gen = 0` in `reconnect_caps_cb()` and `cap->issued = cap->implemented = CEPH_CAP_PIN` in `wake_up_session_cb()` — corrupting a recycled `ceph_cap` (and thus another inode's capability/coherency state), a UAF write primitive usable for heap grooming toward control-flow hijack.\nA:H - The reported real-world outcome is a kernel NULL-pointer dereference oops in `__ceph_remove_cap()` from the trim-caps path (Ceph tracker #43272), and any use-after-free of the cap object crashes the client; the MDS can trigger it repeatedly."
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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/ceph/caps.c",
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"fs/ceph/debugfs.c",
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"fs/ceph/mds_client.c",
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"fs/ceph/mds_client.h",
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"fs/ceph/super.h"
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],
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"versions": [
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{
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"version": "2f2dc053404febedc9c273452d9d518fb31fde72",
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"lessThan": "2b2515b8095cf2149bef44383a99d5b5677f1831",
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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": "2f2dc053404febedc9c273452d9d518fb31fde72",
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"status": "affected",
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"versionType": "git"
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"status": "affected",
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{
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"lessThan": "aaf67de78807c59c35bafb5003d4fb457c764800",
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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/ceph/caps.c",
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"fs/ceph/debugfs.c",
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"fs/ceph/mds_client.c",
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"fs/ceph/mds_client.h",
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"fs/ceph/super.h"
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],
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"versions": [
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{
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"version": "2.6.34",
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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": "2.6.34",
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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": "6.1.28",
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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": "6.2.15",
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"lessThanOrEqual": "6.2.*",
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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": "6.3.2",
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"lessThanOrEqual": "6.3.*",
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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": "6.4",
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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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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.34",
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"versionEndExcluding": "6.1.28"
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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]
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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/2b2515b8095cf2149bef44383a99d5b5677f1831"
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},
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{
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"url": "https://git.kernel.org/stable/c/448875a73e16ba7d81dec9274ce9d33a12d092fb"
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},
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{
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"url": "https://git.kernel.org/stable/c/ae6e935618d99cdba11eab4714092e7e5f13cf7e"
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},
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{
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"url": "https://git.kernel.org/stable/c/aaf67de78807c59c35bafb5003d4fb457c764800"
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}
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],
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"title": "ceph: fix potential use-after-free bug when trimming caps",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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{
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"metrics": [
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"type": "ssvc",
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"content": {
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"id": "CVE-2023-53867",
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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": "yes"
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},
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{
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"Technical Impact": "total"
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:37:43.826196Z"
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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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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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