310 lines
15 KiB
JSON
310 lines
15 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-2026-64004",
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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": "2026-07-19T07:54:57.026Z",
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"datePublished": "2026-07-19T14:56:20.895Z",
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"dateUpdated": "2026-10-19T20:18:02.698Z"
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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": "2026-08-05T12:38:04.824Z"
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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/iucv: fix locking in .getsockopt\n\nMirror iucv_sock_setsockopt() and wrap the whole switch in\nlock_sock()/release_sock(). The pre-existing SO_MSGLIMIT-only lock\nbecomes redundant and is removed.\n\nAny AF_IUCV HIPER user can potentially crash the kernel by racing\nrecvmsg() with getsockopt(SO_MSGSIZE): the SO_MSGSIZE arm dereferences\niucv->hs_dev->mtu after iucv_sock_close() (called from the racing\nrecvmsg()) has set hs_dev to NULL, producing a NULL pointer dereference\noops."
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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 flaw is reached through the getsockopt(2) syscall on an AF_IUCV HIPER socket; the generic socket layer does not acquire the socket lock before calling iucv_sock_getsockopt(), so exploitation requires local access to the socket file descriptor.\nAC:L - The attacker controls both sides of the race by running concurrent getsockopt(SO_MSGSIZE) and recvmsg()/close() threads on the same socket, making the window reliably winnable without external timing luck.\nPR:L - The fix commit explicitly states any AF_IUCV HIPER user can trigger the crash, and iucv_sock_create imposes no capability or root requirement beyond creating and binding a HiperSockets AF_IUCV socket on s390.\nUI:N - Exploitation requires no action from any other user; the attacker races their own syscalls on a socket they control.\nS:U - The impact is a kernel oops or crash within the same kernel security boundary, with no cross-VM, cross-container, or IOMMU boundary crossing.\nC:H - The unlocked TOCTOU between the hs_dev NULL check and dereference races with dev_put() freeing the net_device, creating a use-after-free read whose mtu field is copied to userspace via copy_to_user.\nI:H - Use-after-free on a freed net_device structure in kernel heap memory is a memory corruption primitive that could be further leveraged for control-flow hijacking, and per kernel CVSS guidance UAF bugs warrant High integrity impact.\nA:H - Successful exploitation produces a NULL pointer dereference oops or kernel panic, causing complete loss of availability on the affected IBM Z LPAR or guest."
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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/iucv/af_iucv.c"
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],
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"versions": [
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{
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"version": "51363b8751a673a00ad48eea895266396d53fa52",
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"lessThan": "884eb247b74d86db97e3a37f0d6fc8e1e83590dd",
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"status": "affected",
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},
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{
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"lessThan": "45bb8de8c95d8899f4b8f61bd9bceb8132af73cb",
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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": "51363b8751a673a00ad48eea895266396d53fa52",
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"lessThan": "1fc30bd4e55e2dd622d2d366cecd732c1841bbee",
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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": "51363b8751a673a00ad48eea895266396d53fa52",
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"lessThan": "cd691beafea0dd779e69e81ccc26b0ab50efcb5e",
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"status": "affected",
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{
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"lessThan": "6e792b8dd3002bbc4136745928a9605df1a72b8a",
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"status": "affected",
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"versionType": "git"
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"lessThan": "9817369243380e287ebe5525411557eaa3aa2a79",
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"status": "affected",
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"versionType": "git"
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{
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"version": "51363b8751a673a00ad48eea895266396d53fa52",
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"lessThan": "69554adc7a6fa04ede3ad7512321d83748e3c920",
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"status": "affected",
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{
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"version": "51363b8751a673a00ad48eea895266396d53fa52",
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"lessThan": "3589d20a666caf30ad100c960a2de7de390fce88",
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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/iucv/af_iucv.c"
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],
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"versions": [
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{
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"version": "3.4",
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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": "3.4",
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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": "5.10.259",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.210",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.176",
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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": "6.6.143",
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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": "6.18.35",
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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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"operator": "OR",
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"url": "https://git.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88"
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}
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],
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"title": "net/iucv: fix locking in .getsockopt",
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"engine": "bippy-1.2.0"
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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-2026-64004",
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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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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:35:08.073684Z"
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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-362",
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"description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"
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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": "2026-10-19T20:18:02.698Z"
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} |