230 lines
12 KiB
JSON
230 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-2025-37954",
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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": "2025-04-16T04:51:23.973Z",
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"datePublished": "2025-05-20T16:01:48.561Z",
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"dateUpdated": "2026-10-15T21:52:05.057Z"
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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": "2026-08-05T11:58:37.074Z"
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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\nsmb: client: Avoid race in open_cached_dir with lease breaks\n\nA pre-existing valid cfid returned from find_or_create_cached_dir might\nrace with a lease break, meaning open_cached_dir doesn't consider it\nvalid, and thinks it's newly-constructed. This leaks a dentry reference\nif the allocation occurs before the queued lease break work runs.\n\nAvoid the race by extending holding the cfid_list_lock across\nfind_or_create_cached_dir and when the result is checked."
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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 race is driven by an unsolicited SMB2 lease-break packet from the remote server, dispatched straight from the cifs demultiplex thread into cached_dir_lease_break() (fs/smb/client/smb2misc.c:655) with no pending request. A malicious/compromised SMB server, or an off-path attacker injecting frames on an unsigned SMB connection, controls exactly when that half of the race fires.\nAC:L - The attacker controls both sides — the server chooses when and how often to send lease breaks (unlimited retries, one per re-cached directory), while the client's routine stat()/getdents() traffic, which the server can itself provoke by breaking leases to force re-opens, repeatedly traverses the unlocked window. The same class of race in this file was reproduced by its author with two ordinary shell loops.\nPR:N - The attacking SMB server holds no privileges or credentials on the victim client; it merely answers a share the client has already mounted. The local half needs nothing beyond stat() or readdir() on the mount, available to any unprivileged account with no capabilities.\nUI:N - The mount is a pre-existing configuration, not an exploit-time action, and no deliberate victim participation is needed — ordinary background directory access from any process supplies the local half, and the server can force re-opens on demand by breaking the lease.\nS:U - The leaked dentry/inode references, corrupted superblock teardown and crash are all confined to the client kernel's own security authority. No VM, IOMMU or sandbox boundary is crossed.\nC:N - The defect is a lost reference count; no memory is read out of bounds and no kernel data is copied to the attacker. The only pointer surfaced is in a WARN message, which is %p-hashed and requires dmesg access.\nI:N - The attacker gains no write primitive — nothing attacker-controlled is stored anywhere, and the cfid kref accounting remains balanced in every interleaving I traced, so no double-free or type confusion is reachable.\nA:H - Each won race permanently leaks a dentry, its inode and an open server handle, and the affected mount can never be torn down: unmount hits WARN(1, \"BUG: Dentry ... still in use\") in umount_check() and then \"VFS: Busy inodes after unmount\", which is a hard BUG()/oops under CONFIG_BUG_ON_DATA_CORRUPTION and a panic under panic_on_warn. Otherwise the superblock is freed with live VFS_PTR_POISON'd inodes that crash on any later access, on top of unbounded, unreclaimable memory growth."
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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/smb/client/cached_dir.c"
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],
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"versions": [
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{
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"version": "81ba10959970d15c388bf29866b01b62f387e6a3",
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"lessThan": "2ed98e89ebc2e1bc73534dc3c18cb7843a889ff9",
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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": "81ba10959970d15c388bf29866b01b62f387e6a3",
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"lessThan": "571dcf3d27b24800c171aea7b5e04ff06d10e2e9",
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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": "81ba10959970d15c388bf29866b01b62f387e6a3",
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"lessThan": "2407265dc32bc8cc45b62a612c2a214ba9038e8b",
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{
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"lessThan": "3ca02e63edccb78ef3659bebc68579c7224a6ca2",
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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": "436be190fbf81e5d84040dabf9cb7be06a94dc5d",
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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": "6.5.10",
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"lessThan": "6.6",
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"status": "affected",
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"versionType": "semver"
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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/smb/client/cached_dir.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": "6.6.91",
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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": "6.12.29",
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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": "6.14.7",
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"lessThanOrEqual": "6.14.*",
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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": "6.15",
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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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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6",
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"versionEndExcluding": "6.6.91"
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6",
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"versionEndExcluding": "6.15"
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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": "6.5.10"
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}
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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/2ed98e89ebc2e1bc73534dc3c18cb7843a889ff9"
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},
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{
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"url": "https://git.kernel.org/stable/c/571dcf3d27b24800c171aea7b5e04ff06d10e2e9"
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},
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{
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"url": "https://git.kernel.org/stable/c/2407265dc32bc8cc45b62a612c2a214ba9038e8b"
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},
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{
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"url": "https://git.kernel.org/stable/c/3ca02e63edccb78ef3659bebc68579c7224a6ca2"
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}
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],
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"title": "smb: client: Avoid race in open_cached_dir with lease breaks",
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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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"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-2025-37954",
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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": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:46:24.590387Z"
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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": "2026-10-15T21:52:05.057Z"
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}
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}
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]
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}
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} |