258 lines
14 KiB
JSON
258 lines
14 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-2026-89659",
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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": "2026-09-11T19:38:34.744Z",
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"datePublished": "2026-09-11T19:45:47.587Z",
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"dateUpdated": "2026-10-30T12:32:34.470Z"
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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": "2026-10-30T12:32:34.470Z"
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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: Prevent client use-after-free during delegation revoke\n\nA delegation stateid holds only a bare pointer to its owning\nnfs4_client and does not keep it alive. The client survives its\nstateids only because __destroy_client() drains cl_delegations and\ncl_revoked before free_client() runs.\n\nnfs4_laundromat() breaks that invariant: it unhashes an\nexpired delegation from cl_delegations, drops deleg_lock, then\nrevoke_delegation() relinks it onto cl_revoked under cl_lock. In that\nwindow the delegation is on neither list, so client_has_state() can\nreport no remaining state.\n\nEvery teardown path first requires cl_rpc_users to be zero, but\nthe laundromat holds no such reference. A client whose recalled\ndelegation has just timed out can therefore reach free_client()\nwhile revoke_delegation() is still about to dereference cl_lock,\na use-after-free.\n\nPin the client with cl_rpc_users across the revoke so teardown blocks\nuntil it completes, then reap the delegation from cl_revoked. A client\nalready expiring reaps its own, so skip it and leave the delegation on\ndel_recall_lru."
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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 - The bug is in nfsd nfs4_laundromat()/revoke_delegation() in fs/nfsd/nfs4state.c. A remote NFSv4 client reaches it over TCP/2049 by OPEN to obtain a delegation, a conflicting OPEN to force CB_RECALL, then DESTROY_CLIENTID or CREATE_SESSION replacement while the laundromat revokes.\nAC:L - The attacker controls both sides: it creates the recalled delegation, learns FATTR4_LEASE_TIME, and issues DESTROY_CLIENTID or same-name CREATE_SESSION/SETCLIENTID_CONFIRM while laundromat unhashes. Many recalled delegations widen the unhash-to-revoke window, and the sequence is retryable.\nPR:N - Default AUTH_SYS nfsd exports do no cryptographic authentication; any host allowed by the export ACL can EXCHANGE_ID/SETCLIENTID, OPEN to get a delegation, and DESTROY_CLIENTID. No local account or capability on the NFS server is required.\nUI:N - The attacking NFS client performs the full sequence itself (delegation, recall, teardown). No local user or administrator action on the NFS server is required at attack time.\nS:U - The use-after-free corrupts the nfs4_client object in the host kernel's nfsd state tables. Impact stays in that kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - revoke_delegation() and nfs4_put_stid() dereference sc_client (cl_lock, cl_revoked, cl_stateids) after free_client() kmem_cache_free's the mergeable client_slab object (KMEM_CACHE flags 0), a UAF the attacker can reallocate via EXCHANGE_ID to disclose kernel memory.\nI:H - The UAF writes include spin_lock/unlock of freed cl_lock, list_add onto cl_revoked, and refcount_dec_and_lock in nfs4_put_stid on a reclaimable nfs4_client, enabling heap corruption and control-flow hijack.\nA:H - Use-after-free of nfs4_client in an nfsd/laundromat thread oopses or panics the NFS server even without full exploitation, and the attacker can repeat the RPC sequence to deny service."
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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": "3bd64a5ba1719c2bb6cba4493dfd3e23a7653e54",
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"lessThan": "2f9a200c0ea5b214609b8cea2b6666458bcb54cd",
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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": "3bd64a5ba1719c2bb6cba4493dfd3e23a7653e54",
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"lessThan": "94f0c73797c30a35812ffb32d11b8737d245c405",
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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": "3bd64a5ba1719c2bb6cba4493dfd3e23a7653e54",
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"lessThan": "0dd276b1324a5e08e83c6f675919946c9f0d61c9",
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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": "3bd64a5ba1719c2bb6cba4493dfd3e23a7653e54",
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"lessThan": "3c0a53ee0b442348d8d2286d6960d3f07bb3a3d3",
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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": "3bd64a5ba1719c2bb6cba4493dfd3e23a7653e54",
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"lessThan": "2a9d637c2a8fd8ac29ad9b29f28d122ef75c1a56",
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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": "3bd64a5ba1719c2bb6cba4493dfd3e23a7653e54",
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"lessThan": "4683ca76b3b7e5808338491c6eb3c20e6b4894d5",
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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": "3.10",
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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": "3.10",
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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": "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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{
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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": "3.10",
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"versionEndExcluding": "6.1.191"
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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": "3.10",
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"versionEndExcluding": "6.6.160"
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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/2f9a200c0ea5b214609b8cea2b6666458bcb54cd"
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},
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{
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"url": "https://git.kernel.org/stable/c/94f0c73797c30a35812ffb32d11b8737d245c405"
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},
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{
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"url": "https://git.kernel.org/stable/c/0dd276b1324a5e08e83c6f675919946c9f0d61c9"
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},
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{
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"url": "https://git.kernel.org/stable/c/3c0a53ee0b442348d8d2286d6960d3f07bb3a3d3"
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},
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{
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"url": "https://git.kernel.org/stable/c/2a9d637c2a8fd8ac29ad9b29f28d122ef75c1a56"
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},
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{
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"url": "https://git.kernel.org/stable/c/4683ca76b3b7e5808338491c6eb3c20e6b4894d5"
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}
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],
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"title": "NFSD: Prevent client use-after-free during delegation revoke",
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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-2026-89659",
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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": "2026-10-16T19:25:33.821505Z"
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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": "2026-10-16T19:26:47.601Z"
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}
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}
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]
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}
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} |