300 lines
15 KiB
JSON
300 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-2026-89685",
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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": "2026-09-11T19:38:34.749Z",
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"datePublished": "2026-09-11T19:46:07.116Z",
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"dateUpdated": "2026-10-30T12:32:41.984Z"
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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": "2026-10-30T12:32:41.984Z"
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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\nnfsd: fix clock domain mismatch in clients_still_reclaiming()\n\nclients_still_reclaiming() computes a deadline from nn->boot_time\n(CLOCK_REALTIME, ~1.7 billion) but compares it against\nktime_get_boottime_seconds() (CLOCK_BOOTTIME, seconds since boot).\nThe comparison is always false — it would take ~54 years of uptime\nfor BOOTTIME to exceed the REALTIME-derived deadline.\n\nThis means any client can hold the server in grace indefinitely by\nsending CLAIM_PREVIOUS OPEN requests, blocking all non-reclaim\noperations for all other clients.\n\nAdd boot_time_bt (CLOCK_BOOTTIME) alongside the existing boot_time\nand use it for the deadline computation. boot_time (CLOCK_REALTIME)\nis preserved for its cl_boot clientid-nonce role."
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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 - nfsd processes NFSv4 COMPOUND OPEN over TCP (typically port 2049). A remote peer reaches clients_still_reclaiming() by sending CLAIM_PREVIOUS OPEN or reclaim LOCK, which sets NFSD_NET_SOMEBODY_RECLAIMED and prevents grace from ending.\nAC:L - The attacker fully controls the reclaim OPEN/LOCK RPCs that keep NFSD_NET_SOMEBODY_RECLAIMED set; no race or memory layout is required. Grace always starts with nfsd, and the broken REALTIME-vs-BOOTTIME deadline never fires, so the attacker can extend it at will.\nPR:N - Default nfsd exports accept AUTH_SYS/AUTH_NULL with no credentials. An unauthenticated network peer that is or becomes a recorded NFSv4 client can send CLAIM_PREVIOUS OPEN; no server account or capability is required.\nUI:N - Exploitation takes only attacker-sent NFSv4 RPCs after nfsd starts; no victim user action such as mounting or opening a file is required.\nS:U - The impact stays in the same kernel nfsd/lockd grace state. This is a service denial on the NFS server, not a VM, IOMMU, or sandbox boundary crossing.\nC:N - The bug only miscompares grace deadlines and extends the grace period. It does not disclose kernel memory or file contents.\nI:N - No unauthorized modification of kernel or file data occurs. Other clients are blocked from new mutating operations, which is an availability effect rather than an integrity violation.\nA:H - Successful reclaim OPENs hold nfsd in grace indefinitely because the double-lease deadline never expires, so non-reclaim OPEN/REMOVE/RENAME/SETXATTR and lockd grace return NFS4ERR_GRACE and fully deny NFSv4 service to other clients."
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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/nfsd/netns.h",
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"fs/nfsd/nfs4state.c"
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],
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"versions": [
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{
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"version": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf",
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"lessThan": "7ca44a63d9a554ba7ad05b06d88746eab08b760e",
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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": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf",
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"lessThan": "2c9efc6b692a153643d0f204b3c3632cb6b5761e",
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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": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf",
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"lessThan": "a22ee3a2cadef44f2edeb909ae36bd72450a3a35",
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"status": "affected",
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},
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{
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"lessThan": "04c3e4456fe76e8d7c94171009df3165c3262c51",
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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": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf",
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"lessThan": "e92e80c5b043108029bc729b30d12c37158fb9cb",
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"status": "affected",
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"versionType": "git"
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{
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"version": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf",
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"lessThan": "f9cec313efb2fd18d962aad738a4892bce806016",
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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": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf",
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"lessThan": "9843649196221152b6e5d138a3ce859bdaae1d96",
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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": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf",
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"lessThan": "09ea3eb9a518565f5bca386e81b993ed8825f5e8",
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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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"fs/nfsd/netns.h",
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"fs/nfsd/nfs4state.c"
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],
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"versions": [
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{
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"version": "5.6",
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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": "5.6",
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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": "5.10.273",
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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": "5.15.224",
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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": "6.1.191",
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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": "6.6.160",
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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": "6.12.111",
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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": "6.18.51",
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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": "7.2.4",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"references": [
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"url": "https://git.kernel.org/stable/c/7ca44a63d9a554ba7ad05b06d88746eab08b760e"
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{
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"url": "https://git.kernel.org/stable/c/2c9efc6b692a153643d0f204b3c3632cb6b5761e"
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},
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{
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"url": "https://git.kernel.org/stable/c/a22ee3a2cadef44f2edeb909ae36bd72450a3a35"
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{
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"url": "https://git.kernel.org/stable/c/04c3e4456fe76e8d7c94171009df3165c3262c51"
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},
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{
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"url": "https://git.kernel.org/stable/c/e92e80c5b043108029bc729b30d12c37158fb9cb"
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},
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{
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"url": "https://git.kernel.org/stable/c/f9cec313efb2fd18d962aad738a4892bce806016"
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{
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"url": "https://git.kernel.org/stable/c/9843649196221152b6e5d138a3ce859bdaae1d96"
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},
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{
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"url": "https://git.kernel.org/stable/c/09ea3eb9a518565f5bca386e81b993ed8825f5e8"
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}
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],
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"title": "nfsd: fix clock domain mismatch in clients_still_reclaiming()",
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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-2026-89685",
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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": "2026-10-16T19:25:59.702339Z"
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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": "2026-10-16T19:26:48.681Z"
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}
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}
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]
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}
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} |