251 lines
13 KiB
JSON
251 lines
13 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-2026-64523",
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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": "2026-07-19T15:36:31.794Z",
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"datePublished": "2026-07-25T09:20:47.606Z",
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"dateUpdated": "2026-10-21T12:43:25.473Z"
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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": "2026-10-21T12:43:25.473Z"
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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\nnet/handshake: Take a long-lived file reference at submit\n\nhandshake_nl_accept_doit() needs the file pointer backing\nreq->hr_sk->sk_socket to survive the window between\nhandshake_req_next() and the subsequent FD_PREPARE() and get_file().\nThe submit-side sock_hold() does not provide that. sk_refcnt keeps\nstruct sock alive, but struct socket is owned by sock->file: when\nthe consumer fputs the last file reference, sock_release() tears\nthe socket down regardless of any sock_hold.\n\nAdd an hr_file pointer to struct handshake_req and acquire an\nexplicit reference on sock->file during handshake_req_submit().\nhandshake_complete() and handshake_req_cancel() release the\nreference on the completion-bit-winning path.\n\nThe submit error path must also release the file reference, but\nafter rhashtable insertion a concurrent handshake_req_cancel() can\ndiscover the request and race the error path. Gate the error-path\ncleanup -- sk_destruct restoration, fput, and request destruction\n-- with test_and_set_bit(HANDSHAKE_F_REQ_COMPLETED), the same\nserialization handshake_complete() and handshake_req_cancel()\nalready use. When cancel has already claimed ownership, the submit\nerror path returns without touching the request; socket teardown\nhandles final destruction.\n\nThe accept-side dereferences are not yet retargeted; that change\ncomes in the next patch."
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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 - An unauthenticated remote peer can make network-facing NFS/RPC-over-TLS or TLS-enabled NVMe/TCP consumers submit a handshake, then disconnect or force timeout while tlshd accepts it.\nAC:L - Connection churn lets the attacker repeatedly create handshake requests and drive cancellation while the normal agent accepts; no secret state or uncontrollable memory layout is required.\nPR:N - The RPC_AUTH_TLS probe and NVMe/TCP TLS setup occur before peer authentication. ACCEPT requires init-namespace CAP_NET_ADMIN, but trusted tlshd issues it automatically rather than the attacker.\nUI:N - Kernel consumers and the handshake daemon process the request automatically without any victim user action.\nS:U - Exploitation compromises resources governed by the same host-kernel security authority and does not inherently cross a VM, IOMMU, or other security boundary.\nC:H - The race can dereference reclaimed socket, file, or handshake-request memory; heap reuse of this UAF can provide access to arbitrary kernel data.\nI:H - The stale file pointer reaches refcount-writing operations such as get_file(), while reclaimed request data includes callback pointers, making arbitrary writes or control-flow hijacking defensible.\nA:H - The NULL dereference or use-after-free can cause a kernel oops or panic, and a remote attacker can trigger the race 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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"net/handshake/handshake.h",
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"net/handshake/netlink.c",
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"net/handshake/request.c"
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],
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"versions": [
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{
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"version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae",
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"lessThan": "22e371a93563c30ebebc576db049785e0d7fc617",
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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": "3b3009ea8abb713b022d94fba95ec270cf6e7eae",
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"lessThan": "685b10dd0e32c7782cead16c8cf055c609678583",
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"status": "affected",
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"versionType": "git"
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},
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"version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae",
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"lessThan": "b913801ad9b9a51437d84d030ec6843e08976bd6",
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"status": "affected",
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"versionType": "git"
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},
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"version": "3b3009ea8abb713b022d94fba95ec270cf6e7eae",
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"lessThan": "16eaba5aa89c04eea125905bb8f988c1897f4f29",
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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": "3b3009ea8abb713b022d94fba95ec270cf6e7eae",
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"lessThan": "09dba37eee70d0596e26645015f1aa95a9848e9d",
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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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"net/handshake/handshake.h",
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"net/handshake/netlink.c",
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"net/handshake/request.c"
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],
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"versions": [
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{
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"version": "6.4",
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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": "6.4",
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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": "6.6.160",
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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": "6.12.93",
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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": "6.18.44",
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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": "7.0.12",
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"lessThanOrEqual": "7.0.*",
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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",
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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": "6.4",
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"versionEndExcluding": "6.6.160"
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},
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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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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/22e371a93563c30ebebc576db049785e0d7fc617"
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},
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{
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"url": "https://git.kernel.org/stable/c/685b10dd0e32c7782cead16c8cf055c609678583"
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},
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{
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"url": "https://git.kernel.org/stable/c/b913801ad9b9a51437d84d030ec6843e08976bd6"
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},
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{
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"url": "https://git.kernel.org/stable/c/16eaba5aa89c04eea125905bb8f988c1897f4f29"
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},
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{
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"url": "https://git.kernel.org/stable/c/09dba37eee70d0596e26645015f1aa95a9848e9d"
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}
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],
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"title": "net/handshake: Take a long-lived file reference at submit",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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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-2026-64523",
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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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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:41:36.840538Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-416",
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"description": "CWE-416 Use After Free"
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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": "2026-10-19T20:48:37.874Z"
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}
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}
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]
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}
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} |