298 lines
16 KiB
JSON
298 lines
16 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-2026-89707",
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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": "2026-09-11T19:38:34.751Z",
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"datePublished": "2026-09-11T19:46:23.293Z",
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"dateUpdated": "2026-10-30T12:32:46.529Z"
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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": "2026-10-30T12:32:46.529Z"
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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: release path refs on follow_down() error\n\nnfsd_cross_mnt() initializes a local struct path with mntget() and\ndget() before calling follow_down(). On a negative return the error\narm jumps to out without releasing those references:\n\n err = follow_down(&path, follow_flags);\n if (err < 0)\n goto out;\n\nfollow_down() never drops the caller's entry-time refs on any error\nsub-case; for example a pre-cross d_manage() failure leaves path\nuntouched, so the mntget()/dget() taken on entry survive the call.\n\nEvery other early-exit arm in nfsd_cross_mnt() (other-namespace\nreturn, IS_ERR(exp2), and the success tail after the swap) already\ncalls path_put(&path); the err < 0 arm is the lone omission. The\nleak inflates mnt_count and d_count on each failed cross-mount,\nblocking umount and pinning dentries against the shrinker, and is\nreachable by any authenticated NFS client through nfsd_lookup_dentry\nor the NFSv4 READDIR encode path.\n\nFix by calling path_put(&path) before the goto out in the err < 0\narm so the entry-time refs are released on all follow_down() error\nreturns."
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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_cross_mnt() runs in the in-kernel NFS server on TCP/UDP 2049 from nfsd_lookup_dentry() (NFSv2/v3/v4 LOOKUP) and nfsd4_encode_entry4_fattr() (NFSv4 READDIR); a remote client reaches it with ordinary RPC requests.\nAC:L - On a typical nfsd export of autofs homes or nested mounts with crossmnt, an attacker can deterministically make follow_down() fail (autofs d_manage/automount error) by repeating LOOKUP/READDIR of failing mount triggers; no race or victim-controlled layout is required.\nPR:N - Default nfsd exports accept RPC_AUTH_NULL and RPC_AUTH_UNIX with no password; fh_verify only checks export IP policy, a MOUNT/PUTROOTFH filehandle, and directory execute, so no Linux account or capability on the server is required.\nUI:N - The attacker triggers the leak with their own NFS LOOKUP or READDIR RPCs; no victim mount, click, or other interactive action is required.\nS:U - The leak inflates dentry and vfsmount refcounts inside the nfsd host kernel and does not cross a VM, IOMMU, or other separate security authority.\nC:N - The bug only fails to path_put() the mntget/dget taken before follow_down(); it does not read kernel or file data or provide an information-disclosure primitive.\nI:N - The bug does not write attacker-controlled data or corrupt kernel objects; it only retains extra references on existing dentries and mounts.\nA:H - Each failed follow_down() permanently pins the dentry and vfsmount; repeated LOOKUPs of distinct autofs/mountpoint names leave unreclaimable dentries, block umount, and can exhaust kernel memory for a system-wide DoS."
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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/vfs.c"
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],
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"versions": [
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{
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"version": "cc53ce53c86924bfe98a12ea20b7465038a08792",
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"lessThan": "bdf5a0f88d21239d8f9f7519b87359ba95fd045c",
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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": "cc53ce53c86924bfe98a12ea20b7465038a08792",
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"lessThan": "18847cbf5900f5c6c55bef5a6f7a34a1918d1181",
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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": "cc53ce53c86924bfe98a12ea20b7465038a08792",
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"lessThan": "e301c5cdb0dc2c4aeffc0c055ea15615d9c51fdc",
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"status": "affected",
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},
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{
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"version": "cc53ce53c86924bfe98a12ea20b7465038a08792",
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"lessThan": "085cfde7c2186acaad103f02d2c25435ad5224e9",
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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": "cc53ce53c86924bfe98a12ea20b7465038a08792",
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"lessThan": "194316df81263519156ebe714c4a286bee00e5be",
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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": "cc53ce53c86924bfe98a12ea20b7465038a08792",
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"lessThan": "467d56fd3ff57447a790c6dc3ede2d02a947d224",
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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": "cc53ce53c86924bfe98a12ea20b7465038a08792",
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"lessThan": "2bc4343308d85ee4e0dd3877b384306c96f114c2",
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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": "cc53ce53c86924bfe98a12ea20b7465038a08792",
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"lessThan": "6cba08dc1922140d260cfeb30bbda4ee1bf869d8",
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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/vfs.c"
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],
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"versions": [
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{
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"version": "2.6.38",
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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": "2.6.38",
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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": "6.6.157",
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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": "6.12.109",
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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": "6.18.50",
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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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{
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"nodes": [
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"operator": "OR",
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"negate": false,
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"versionStartIncluding": "2.6.38",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/bdf5a0f88d21239d8f9f7519b87359ba95fd045c"
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},
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{
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"url": "https://git.kernel.org/stable/c/18847cbf5900f5c6c55bef5a6f7a34a1918d1181"
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{
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"url": "https://git.kernel.org/stable/c/e301c5cdb0dc2c4aeffc0c055ea15615d9c51fdc"
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},
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"url": "https://git.kernel.org/stable/c/085cfde7c2186acaad103f02d2c25435ad5224e9"
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},
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{
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"url": "https://git.kernel.org/stable/c/194316df81263519156ebe714c4a286bee00e5be"
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},
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"url": "https://git.kernel.org/stable/c/467d56fd3ff57447a790c6dc3ede2d02a947d224"
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{
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"url": "https://git.kernel.org/stable/c/2bc4343308d85ee4e0dd3877b384306c96f114c2"
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},
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{
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"url": "https://git.kernel.org/stable/c/6cba08dc1922140d260cfeb30bbda4ee1bf869d8"
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}
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],
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"title": "nfsd: release path refs on follow_down() error",
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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-2026-89707",
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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": "2026-10-16T19:26:16.926763Z"
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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": "2026-10-16T19:26:49.252Z"
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}
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}
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]
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}
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} |