235 lines
12 KiB
JSON
235 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-2026-74258",
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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": "2026-08-15T05:44:03.877Z",
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"datePublished": "2026-08-15T05:57:36.257Z",
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"dateUpdated": "2026-10-16T18:55:28.406Z"
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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": "2026-10-03T10:55:56.675Z"
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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\nbpf: Guard __get_user acesss with access_ok for uprobe_multi data\n\nAs reported by sashiko [1] we need to use access_ok to check the user\nspace data bounds before we use __get-user to get it.\n\n[1] https://lore.kernel.org/bpf/20260610145235.CB1441F00893@smtp.kernel.org/"
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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:L - The bug is in bpf_uprobe_multi_link_attach(), reached only via the local bpf(BPF_LINK_CREATE) syscall with BPF_TRACE_UPROBE_MULTI; per kernel CNA guidance BPF/uprobe link creation is Local, not network-reachable.\nAC:L - The attacker fully controls link_create.uprobe_multi offsets/ref_ctr_offsets/cookies pointers and cnt, so __get_user runs on attacker-chosen addresses without races or external conditions; repeated attempts reliably leak or fault.\nPR:L - Exploitation requires a BPF_PROG_TYPE_KPROBE program (CAP_BPF+CAP_PERFMON), routinely delegated via BPF tokens into non-init user namespaces for tracing/container workloads; this is low privilege, not init-namespace root.\nUI:N - No victim interaction is needed; the attacker loads the BPF program, issues BPF_LINK_CREATE with crafted pointers, and can read leaked data back via BPF_OBJ_GET_INFO_BY_FD on their own link.\nS:U - Impact is arbitrary kernel memory disclosure and possible host compromise within the same kernel security authority; it does not cross VM, IOMMU, or container sandbox boundaries by itself.\nC:H - Missing access_ok lets __get_user copy from kernel addresses into uprobes arrays (up to cnt*8 bytes); cookies/offsets can be exfiltrated through bpf_uprobe_multi_link_fill_link_info, giving arbitrary kernel memory read.\nI:H - Leaked kernel pointers and attacker-influenced offset/ref_ctr values feed uprobe_register() breakpoint installation, and the read primitive is standardly chained into arbitrary kernel write and privilege escalation.\nA:H - __get_user on non-userspace addresses can fault under SMAP/PAN and oops the kernel; even failed exploitation attempts can crash the host, and guidance treats serious uaccess bugs as high availability impact."
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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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"kernel/trace/bpf_trace.c"
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],
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"versions": [
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{
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"version": "89ae89f53d201143560f1e9ed4bfa62eee34f88e",
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"lessThan": "ff6c5ee77dcc98381290d16af53f6262625870a6",
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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": "89ae89f53d201143560f1e9ed4bfa62eee34f88e",
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"lessThan": "2c387db784293256d35fd3d438f577cc82bb823d",
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"status": "affected",
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"versionType": "git"
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{
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"version": "89ae89f53d201143560f1e9ed4bfa62eee34f88e",
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"lessThan": "a9f1395028c2bbe18e57864cc355c11faff488cb",
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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": "4d87a251d45b4a95eb4c0abcfab809c9f231258a",
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"status": "affected",
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"versionType": "git"
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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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"kernel/trace/bpf_trace.c"
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],
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"versions": [
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{
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"version": "6.6",
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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": "6.6",
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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": "6.6.158",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.111",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.53",
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"lessThanOrEqual": "6.18.*",
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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": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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"operator": "OR",
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"negate": false,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6",
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"versionEndExcluding": "6.6.158"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/ff6c5ee77dcc98381290d16af53f6262625870a6"
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},
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{
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"url": "https://git.kernel.org/stable/c/2c387db784293256d35fd3d438f577cc82bb823d"
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},
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{
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"url": "https://git.kernel.org/stable/c/a9f1395028c2bbe18e57864cc355c11faff488cb"
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},
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{
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"url": "https://git.kernel.org/stable/c/c6d51ad36490013ee9df94a372d3bf794bd304d1"
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},
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{
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"url": "https://git.kernel.org/stable/c/4d87a251d45b4a95eb4c0abcfab809c9f231258a"
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}
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],
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"title": "bpf: Guard __get_user acesss with access_ok for uprobe_multi data",
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"x_generator": {
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"engine": "bippy-1.2.0"
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"adp": [
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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-2026-74258",
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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": "total"
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"version": "2.0.3",
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"timestamp": "2026-10-16T18:51:32.873038Z"
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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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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T18:55:28.406Z"
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} |