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CVE-2026-89669 (GCVE-0-2026-89669)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:45 – Updated: 2026-09-14 12:01
VLAI
Title
nfsd: initialize copy-notify stateid before publishing it
Summary
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
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < 863b6e995665472f2af5be2436a874ab6a9e5ac6 (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < d18d36395d973ef7372c8e6724970585f75b5c0b (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < 4415a692346a39fdb647cbd717eda510159aaf55 (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < 9caad13b7cfe9ccb90cc405ac77335800e086595 (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < e08a3dcaca0505f861e344a387f37f94d95dbdc2 (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < a4d7fedcaaf33e60a01e53eafca9041ef966212f (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < 4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < 129643893b79f8a3c6b72045f933fbab5ee424ca (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfs4proc.c",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "version": "5.6"
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              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
            }
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        }
      ],
      "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\u0027s sc_cp_list, with cs_count == 1 (the\nmembership reference) and none held for the caller. A racing\nOFFLOAD_CANCEL (crafted cl_id == nn-\u003es2s_cp_cl_id plus the guessable\nso_id) could reach manage_cpntf_state() and free the entry, turning the\ncaller\u0027s 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": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "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-\u003es2s_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\u0027d nfs4_cpntf_state in the host kernel\u0027s 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\u0027s the object (cs_count was 1), nfsd4_copy_notify memcpy\u0027s 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T12:01:55.666Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/863b6e995665472f2af5be2436a874ab6a9e5ac6"
        },
        {
          "url": "https://git.kernel.org/stable/c/d18d36395d973ef7372c8e6724970585f75b5c0b"
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        {
          "url": "https://git.kernel.org/stable/c/9caad13b7cfe9ccb90cc405ac77335800e086595"
        },
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          "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",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89669",
    "datePublished": "2026-09-11T19:45:55.111Z",
    "dateReserved": "2026-09-11T19:38:34.746Z",
    "dateUpdated": "2026-09-14T12:01:55.666Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89669",
      "date": "2026-09-15",
      "epss": "0.00684",
      "percentile": "0.50692"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-14T14:46:59.000Z",
      "cve": "CVE-2026-89669",
      "id": "msrc_CVE-2026-89669",
      "initial_release_date": "2026-09-13T01:01:45.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "nfsd: initialize copy-notify stateid before publishing it",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89669.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89669\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:19:53.397\",\"lastModified\":\"2026-09-14T13:19:18.870\",\"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\u0027s sc_cp_list, with cs_count == 1 (the\\nmembership reference) and none held for the caller. A racing\\nOFFLOAD_CANCEL (crafted cl_id == nn-\u003es2s_cp_cl_id plus the guessable\\nso_id) could reach manage_cpntf_state() and free the entry, turning the\\ncaller\u0027s 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-rc1\",\"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\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-13T06:51:39+00:00",
      "cve": "CVE-2026-89669",
      "id": "CVE-2026-89669",
      "initial_release_date": "2026-09-11T19:45:55.111000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux Kernel: nfsd use-after-free vulnerability via racing OFFLOAD_CANCEL",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89669.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-16T00:00:41Z",
      "cve": "CVE-2026-89669",
      "id": "CVE-2026-89669",
      "initial_release_date": "2026-09-12T16:23:58Z",
      "product_status:known_affected": "210",
      "product_status:known_not_affected": "143",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89669",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89669.json",
      "version": "4"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.