CVE-2026-89669

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89669", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.746Z", "datePublished": "2026-09-11T19:45:55.111Z", "dateUpdated": "2026-10-19T08:50:42.637Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:50:42.637Z"}, "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."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "AV:N - The UAF is in nfsd COPY_NOTIFY (nfsd4_copy_notify/nfs4_alloc_init_cpntf_state). NFSv4.2 COPY_NOTIFY and a racing OFFLOAD_CANCEL are processed from compounds over TCP/2049 via nfsd4_proc_compound, so a remote NFS client reaches the published cpntf object over the network.\nAC:L - The attacker controls both sides: one compound publishes the cpntf IDR entry via COPY_NOTIFY while a concurrent OFFLOAD_CANCEL uses the leaked nn->s2s_cp_cl_id and a cyclic guessable so_id to kfree it before initialization finishes; the race is retryable on multiple session slots with no condition outside attacker control.\nPR:N - Default AUTH_SYS/AUTH_NULL nfsd exports do no cryptographic authentication; any host allowed by the export ACL can EXCHANGE_ID/CREATE_SESSION, OPEN a readable file, and issue COPY_NOTIFY and OFFLOAD_CANCEL. No local account or capability on the NFS server is required.\nUI:N - The attacking NFS client drives COPY_NOTIFY and the concurrent OFFLOAD_CANCEL on its own connections; no victim user or administrator action on the NFS server is required at attack time.\nS:U - The use-after-free corrupts a kmalloc'd nfs4_cpntf_state in the host kernel's nfsd copy-notify tables. Impact stays in that kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - After OFFLOAD_CANCEL kfree's the object (cs_count was 1), nfsd4_copy_notify memcpy's the freed cp_stateid.cs_stid into the RPC reply; reclaim of that kmalloc slab lets the attacker disclose kernel memory. Per kernel guidance a use-after-free is C:H.\nI:H - The same path then writes cp_p_stateid and cp_p_clid into the freed nfs4_cpntf_state, a use-after-free write primitive usable for heap corruption and control-flow hijacking. Per kernel guidance a use-after-free is I:H.\nA:H - Use-after-free of nfs4_cpntf_state in an nfsd worker oopses or panics the NFS server even without full exploitation, and the attacker can repeat the concurrent RPC sequence to deny service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/nfs4proc.c", "fs/nfsd/nfs4state.c"], "versions": [{"version": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "863b6e995665472f2af5be2436a874ab6a9e5ac6", "status": "affected", "versionType": "git"}, {"version": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "d18d36395d973ef7372c8e6724970585f75b5c0b", "status": "affected", "versionType": "git"}, {"version": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "4415a692346a39fdb647cbd717eda510159aaf55", "status": "affected", "versionType": "git"}, {"version": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "9caad13b7cfe9ccb90cc405ac77335800e086595", "status": "affected", "versionType": "git"}, {"version": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "e08a3dcaca0505f861e344a387f37f94d95dbdc2", "status": "affected", "versionType": "git"}, {"version": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "a4d7fedcaaf33e60a01e53eafca9041ef966212f", "status": "affected", "versionType": "git"}, {"version": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b", "status": "affected", "versionType": "git"}, {"version": "624322f1adc58acd0b69f77a6ddc764207e97241", "lessThan": "129643893b79f8a3c6b72045f933fbab5ee424ca", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/nfs4proc.c", "fs/nfsd/nfs4state.c"], "versions": [{"version": "5.6", "status": "affected"}, {"version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.10.270"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/863b6e995665472f2af5be2436a874ab6a9e5ac6"}, {"url": "https://git.kernel.org/stable/c/d18d36395d973ef7372c8e6724970585f75b5c0b"}, {"url": "https://git.kernel.org/stable/c/4415a692346a39fdb647cbd717eda510159aaf55"}, {"url": "https://git.kernel.org/stable/c/9caad13b7cfe9ccb90cc405ac77335800e086595"}, {"url": "https://git.kernel.org/stable/c/e08a3dcaca0505f861e344a387f37f94d95dbdc2"}, {"url": "https://git.kernel.org/stable/c/a4d7fedcaaf33e60a01e53eafca9041ef966212f"}, {"url": "https://git.kernel.org/stable/c/4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b"}, {"url": "https://git.kernel.org/stable/c/129643893b79f8a3c6b72045f933fbab5ee424ca"}], "title": "nfsd: initialize copy-notify stateid before publishing it", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/nfsd/nfs4proc.c", "fs/nfsd/nfs4state.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "863b6e995665472f2af5be2436a874ab6a9e5ac6", "status": "affected", "version": "624322f1adc58acd0b69f77a6ddc764207e97241", "versionType": "git"}, {"lessThan": "d18d36395d973ef7372c8e6724970585f75b5c0b", "status": "affected", "version": "624322f1adc58acd0b69f77a6ddc764207e97241", "versionType": "git"}, {"lessThan": "4415a692346a39fdb647cbd717eda510159aaf55", "status": "affected", "version": "624322f1adc58acd0b69f77a6ddc764207e97241", "versionType": "git"}, {"lessThan": "9caad13b7cfe9ccb90cc405ac77335800e086595", "status": "affected", "version": "624322f1adc58acd0b69f77a6ddc764207e97241", "versionType": "git"}, {"lessThan": "e08a3dcaca0505f861e344a387f37f94d95dbdc2", "status": "affected", "version": "624322f1adc58acd0b69f77a6ddc764207e97241", "versionType": "git"}, {"lessThan": "a4d7fedcaaf33e60a01e53eafca9041ef966212f", "status": "affected", "version": "624322f1adc58acd0b69f77a6ddc764207e97241", "versionType": "git"}, {"lessThan": "4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b", "status": "affected", "version": "624322f1adc58acd0b69f77a6ddc764207e97241", "versionType": "git"}, {"lessThan": "129643893b79f8a3c6b72045f933fbab5ee424ca", "status": "affected", "version": "624322f1adc58acd0b69f77a6ddc764207e97241", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/nfsd/nfs4proc.c", "fs/nfsd/nfs4state.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.6"}, {"lessThan": "5.6", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "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."}], "id": "CVE-2026-89669", "lastModified": "2026-10-19T09:18:04.990", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-11T20:19:53.397", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "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"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux Kernel: nfsd use-after-free vulnerability via racing OFFLOAD_CANCEL", "id": "2532111", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532111"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the `nfsd` component of the Linux kernel. A use-after-free vulnerability exists due to improper initialization of the copy-notify state ID before its publication. A remote attacker could exploit this by sending a crafted `OFFLOAD_CANCEL` operation, leading to a race condition that frees the state ID prematurely. This could result in a use-after-free, potentially allowing for arbitrary code execution or denial of service."], "name": "CVE-2026-89669", "public_date": "2026-09-11T19:45:55Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89669\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89669\nhttps://git.kernel.org/stable/c/129643893b79f8a3c6b72045f933fbab5ee424ca\nhttps://git.kernel.org/stable/c/4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b\nhttps://git.kernel.org/stable/c/a4d7fedcaaf33e60a01e53eafca9041ef966212f\nhttps://git.kernel.org/stable/c/e08a3dcaca0505f861e344a387f37f94d95dbdc2"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[624322f1adc58acd0b69f77a6ddc764207e97241,e08a3dcaca0505f861e344a387f37f94d95dbdc2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[624322f1adc58acd0b69f77a6ddc764207e97241,a4d7fedcaaf33e60a01e53eafca9041ef966212f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[624322f1adc58acd0b69f77a6ddc764207e97241,4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[624322f1adc58acd0b69f77a6ddc764207e97241,129643893b79f8a3c6b72045f933fbab5ee424ca)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.6"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.6)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.109,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.50,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.4,7.2.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T06:15:04.246512+00:00", "updated": "2026-09-15T20:30:10.354617+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}