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vuln-cve/data/2026/89xxx/CVE-2026-89680.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-89680",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-11T19:38:34.748Z",
"datePublished": "2026-09-11T19:46:03.468Z",
"dateUpdated": "2026-10-30T12:32:39.849Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-30T12:32:39.849Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix nfsd_file leak on inter-server COPY setup failure\n\nWhen nfsd4_setup_inter_ssc() fails, nfsd4_copy() returns\nnfserr_offload_denied directly, bypassing the out: label where\nrelease_copy_files() would drop the nf_dst reference taken by\nnfs4_preprocess_stateid_op(). Each failed inter-server COPY\nleaks one nfsd_file, pinning file/inode/dentry/vfsmount.\n\nFix by setting status and jumping to out: instead of returning\ndirectly."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - nfsd's NFSv4.2 OP_COPY is reached over TCP/2049: svc_recv to nfsd_dispatch to nfsd4_proc_compound to nfsd4_copy to nfsd4_setup_inter_ssc. A remote client triggers the leak with a COMPOUND; no local access to the server is required.\nAC:L - Once inter-server COPY offload is enabled, the attacker controls every trigger: async COPY on the wire, a valid dest write stateid, and a source nl4_server that makes nfsd4_interssc_connect fail (bad uaddr/netid or failed mount). No race or attacker-uncontrollable layout is required.\nPR:N - Under default AUTH_SYS, EXCHANGE_ID/CREATE_SESSION and OPEN verify no secret; a remote client permitted by the export asserts a UID and obtains write stateids. This matches PR:N on the same nfsd4_copy path (CVE-2024-53073, CVE-2024-50241).\nUI:N - The attacker's own NFSv4.2 COMPOUND traffic drives nfsd4_copy; no administrator or local user on the server must mount, open a file, or otherwise interact beyond nfsd already serving an export.\nS:U - The leaked nfsd_file reference pins file/inode/dentry/vfsmount inside the NFS server kernel's own security authority; there is no VM, IOMMU, or sandbox boundary crossing.\nC:N - The defect only skips nfsd_file_put() on an extra filecache reference taken by nfs4_preprocess_stateid_op(); there is no out-of-bounds read, use-after-free, or other disclosure of kernel memory to the client.\nI:N - COPY setup fails before nfsd_copy_range, so no file data is modified; the leaked reference is not attacker-controlled reused memory and yields no write or control-flow primitive.\nA:H - Each failed inter-server COPY permanently leaks one nfsd_file ref, pinning the dest file/inode/dentry/vfsmount. Repeating against many created-then-unlinked files unbounded-pins slab and inodes and blocks umount, enabling remote kernel memory exhaustion and NFS server DoS."
}
]
}
],
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{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/nfsd/nfs4proc.c"
],
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{
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{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
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],
"versions": [
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"status": "affected"
},
{
"version": "0",
"lessThan": "5.6",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.273",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
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},
{
"version": "5.15.224",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
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},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
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},
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"lessThanOrEqual": "6.6.*",
"status": "unaffected",
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},
{
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"lessThanOrEqual": "6.12.*",
"status": "unaffected",
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},
{
"version": "6.18.50",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
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},
{
"version": "7.2.4",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
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},
{
"version": "7.3",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
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"cpeApplicability": [
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"nodes": [
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"operator": "OR",
"negate": false,
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"references": [
{
"url": "https://git.kernel.org/stable/c/d15f76fddc5d0215db5f18851048376a1ea79bd6"
},
{
"url": "https://git.kernel.org/stable/c/eb22420e5bd6eb3afa1f840036bb08a7ac90db76"
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{
"url": "https://git.kernel.org/stable/c/94c28af6fd89cb204975e49b824f8ee521bb84e9"
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{
"url": "https://git.kernel.org/stable/c/ab949252fdf102ae74329a0caa7995a849d0dafa"
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{
"url": "https://git.kernel.org/stable/c/1a6a41b848455bf6ba2c9da2dfb0730e608ce7ab"
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{
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{
"url": "https://git.kernel.org/stable/c/6ed8d6de7ec90c4ba84eb82673058f506e5777fd"
},
{
"url": "https://git.kernel.org/stable/c/88a76145451d703eedd867b5989bf73d17340399"
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],
"title": "nfsd: fix nfsd_file leak on inter-server COPY setup failure",
"x_generator": {
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}
}
}
}
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