CVE-2026-89669
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: initialize copy-notify stateid before publishing it nfsd4_copy_notify() finished initializing the cpntf state after nfs4_alloc_init_cpntf_state() had already linked it into the s2s_cp_stateids IDR and the parent's sc_cp_list, with cs_count == 1 (the membership reference) and none held for the caller. A racing OFFLOAD_CANCEL (crafted cl_id == nn->s2s_cp_cl_id plus the guessable so_id) could reach manage_cpntf_state() and free the entry, turning the caller's subsequent cpn_cnr_stateid read and cp_p_stateid/cp_p_clid writes into use-after-free. The owning clientid was also only recorded after publication, so it could not gate an ownership check in that window. Record cp_p_stateid and cp_p_clid inside nfs4_alloc_init_cpntf_state() before nfs4_init_cp_state() publishes the entry, and return it with an extra reference. The caller reads the stateid under that reference and drops it with nfs4_put_cpntf_state(); on a late error the laundromat reaps the entry.
Severity
CRITICAL
CVSS score
9.8
(v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-11 20:19:53.397000
Last modified
2026-10-19 09:18:04.990000
View original CVE JSON
{
"id": "CVE-2026-89669",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-11T20:19:53.397",
"lastModified": "2026-10-19T09:18:04.990",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: initialize copy-notify stateid before publishing it\n\nnfsd4_copy_notify() finished initializing the cpntf state after\nnfs4_alloc_init_cpntf_state() had already linked it into the\ns2s_cp_stateids IDR and the parent's sc_cp_list, with cs_count == 1 (the\nmembership reference) and none held for the caller. A racing\nOFFLOAD_CANCEL (crafted cl_id == nn->s2s_cp_cl_id plus the guessable\nso_id) could reach manage_cpntf_state() and free the entry, turning the\ncaller's subsequent cpn_cnr_stateid read and cp_p_stateid/cp_p_clid\nwrites into use-after-free. The owning clientid was also only recorded\nafter publication, so it could not gate an ownership check in that window.\n\nRecord cp_p_stateid and cp_p_clid inside nfs4_alloc_init_cpntf_state()\nbefore nfs4_init_cp_state() publishes the entry, and return it with an\nextra reference. The caller reads the stateid under that reference and\ndrops it with nfs4_put_cpntf_state(); on a late error the laundromat\nreaps the entry."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"fs/nfsd/nfs4proc.c",
"fs/nfsd/nfs4state.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "624322f1adc58acd0b69f77a6ddc764207e97241",
"lessThan": "863b6e995665472f2af5be2436a874ab6a9e5ac6",
"versionType": "git",
"status": "affected"
},
{
"version": "624322f1adc58acd0b69f77a6ddc764207e97241",
"lessThan": "d18d36395d973ef7372c8e6724970585f75b5c0b",
"versionType": "git",
"status": "affected"
},
{
"version": "624322f1adc58acd0b69f77a6ddc764207e97241",
"lessThan": "4415a692346a39fdb647cbd717eda510159aaf55",
"versionType": "git",
"status": "affected"
},
{
"version": "624322f1adc58acd0b69f77a6ddc764207e97241",
"lessThan": "9caad13b7cfe9ccb90cc405ac77335800e086595",
"versionType": "git",
"status": "affected"
},
{
"version": "624322f1adc58acd0b69f77a6ddc764207e97241",
"lessThan": "e08a3dcaca0505f861e344a387f37f94d95dbdc2",
"versionType": "git",
"status": "affected"
},
{
"version": "624322f1adc58acd0b69f77a6ddc764207e97241",
"lessThan": "a4d7fedcaaf33e60a01e53eafca9041ef966212f",
"versionType": "git",
"status": "affected"
},
{
"version": "624322f1adc58acd0b69f77a6ddc764207e97241",
"lessThan": "4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b",
"versionType": "git",
"status": "affected"
},
{
"version": "624322f1adc58acd0b69f77a6ddc764207e97241",
"lessThan": "129643893b79f8a3c6b72045f933fbab5ee424ca",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"fs/nfsd/nfs4proc.c",
"fs/nfsd/nfs4state.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "5.6",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.6",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.270",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.221",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.188",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.157",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.109",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.50",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.4",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 3.9,
"impactScore": 5.9
}
]
},
"references": [
{
"url": "https://git.kernel.org/stable/c/129643893b79f8a3c6b72045f933fbab5ee424ca",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/4415a692346a39fdb647cbd717eda510159aaf55",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/863b6e995665472f2af5be2436a874ab6a9e5ac6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9caad13b7cfe9ccb90cc405ac77335800e086595",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a4d7fedcaaf33e60a01e53eafca9041ef966212f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d18d36395d973ef7372c8e6724970585f75b5c0b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e08a3dcaca0505f861e344a387f37f94d95dbdc2",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}