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CVE-2026-89663 (GCVE-0-2026-89663)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:45 – Updated: 2026-09-14 12:01
VLAI
Title
nfsd: revoke copy-notify stateids before dropping their reference
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: revoke copy-notify stateids before dropping their reference Copy-notify stateids live in the s2s_cp_stateids IDR and on their parent stid's sc_cp_list, pinned by a single membership reference. _free_cpntf_state_locked() only unlinks an entry once its refcount reaches zero, so any revoke path that runs while a concurrent find_cpntf_state()/manage_cpntf_state() holder has elevated cs_count drops the reference without unlinking, leaving the entry discoverable with its membership reference already consumed. A second revoke or a laundromat tick then frees it while the reader still holds the pointer -- a KASAN-detectable use-after-free at the reader's nfs4_put_cpntf_state(). This affected all three revoke paths: - The parent-stid drain (nfs4_free_cpntf_statelist()) repeatedly called _free_cpntf_state_locked() on the first list entry; a holder that had bumped cs_count made it return early, so the next iteration re-decremented and burned the holder's reference. - OFFLOAD_CANCEL (manage_cpntf_state()) and laundromat expiry likewise used _free_cpntf_state_locked() and could drop 2->1 without unlinking. Add revoke_cpntf_state_locked(), which unhashes the entry from the IDR and sc_cp_list first (deferring the final free to any holder), and use it from all three revoke paths. The drain now walks with list_for_each_entry_safe() and revokes each entry unconditionally, so it terminates in one pass per entry regardless of cs_count. The unhash is gated on !list_empty(&cps->cp_list); the idr_remove() gate matters because idr_alloc_cyclic() may have recycled the so_id by then. Keep _free_cpntf_state_locked() for the reference-holder put path only, where a concurrent revoke may already have unlinked the entry (its list_del_init() then a no-op).
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < 5f00e0ab4de45d4f9e4bd0883cf2517acf63fc0d (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < 06a62f6dbc60791f4229c6950b1eec6b18df9af1 (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < a1fca0f7bbb7b100a39c7ba8dd7922c87c4237a3 (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < caddbeffab1eaba1d2bcf5ceda35547863466705 (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < 6b8149448cdcb476fba4559d1ecc247efee9971b (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < b56d2c5f01cddbeca7d11cce81d97db4ec9a464f (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < ff8a3cff02b92b2a82f1a9876038fcf953ae9c25 (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < 3b0c3595db99bb4bebd7c8aa8a36f3c50e411bb7 (git)
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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)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: revoke copy-notify stateids before dropping their reference\n\nCopy-notify stateids live in the s2s_cp_stateids IDR and on their parent\nstid\u0027s sc_cp_list, pinned by a single membership reference.\n_free_cpntf_state_locked() only unlinks an entry once its refcount reaches\nzero, so any revoke path that runs while a concurrent\nfind_cpntf_state()/manage_cpntf_state() holder has elevated cs_count drops\nthe reference without unlinking, leaving the entry discoverable with its\nmembership reference already consumed. A second revoke or a laundromat tick\nthen frees it while the reader still holds the pointer -- a\nKASAN-detectable use-after-free at the reader\u0027s nfs4_put_cpntf_state().\n\nThis affected all three revoke paths:\n\n  - The parent-stid drain (nfs4_free_cpntf_statelist()) repeatedly called\n    _free_cpntf_state_locked() on the first list entry; a holder that had\n    bumped cs_count made it return early, so the next iteration\n    re-decremented and burned the holder\u0027s reference.\n\n  - OFFLOAD_CANCEL (manage_cpntf_state()) and laundromat expiry likewise\n    used _free_cpntf_state_locked() and could drop 2-\u003e1 without unlinking.\n\nAdd revoke_cpntf_state_locked(), which unhashes the entry from the IDR and\nsc_cp_list first (deferring the final free to any holder), and use it from\nall three revoke paths. The drain now walks with list_for_each_entry_safe()\nand revokes each entry unconditionally, so it terminates in one pass per\nentry regardless of cs_count. The unhash is gated on\n!list_empty(\u0026cps-\u003ecp_list); the idr_remove() gate matters because\nidr_alloc_cyclic() may have recycled the so_id by then. Keep\n_free_cpntf_state_locked() for the reference-holder put path only, where a\nconcurrent revoke may already have unlinked the entry (its list_del_init()\nthen a no-op)."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The flaw is in the in-kernel NFS server (nfsd); COPY_NOTIFY, READ using a copy-notify stateid, CLOSE, and OFFLOAD_CANCEL are processed from NFSv4.2 compounds over TCP/2049, so a remote NFS client reaches the use-after-free over the network.\nAC:L - A malicious client fully controls both sides of the race: one compound READs with the copy-notify stateid so find_cpntf_state holds a cs_count reference while a concurrent CLOSE or OFFLOAD_CANCEL drains it; nfs4_free_cpntf_statelist then double-decrements and kfree\u0027s the still-linked object with no condition outside attacker control.\nPR:L - The attacker must be an established NFSv4.2 client of an export holding a valid open, lock, or delegation stateid to issue COPY_NOTIFY, which is authenticated low-privilege service access rather than a pre-authentication nfsd path.\nUI:N - No victim action is required; the attacking client drives COPY_NOTIFY, the concurrent READ that holds the cpntf reference, and CLOSE or OFFLOAD_CANCEL on its own NFS connections.\nS:U - The use-after-free corrupts kernel slab memory within the host nfsd security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - Use-after-free of struct nfs4_cpntf_state lets a concurrent find_cpntf_state reader dereference a kfree\u0027d object; heap reuse of that slab gives the attacker control over freed contents, enabling arbitrary kernel memory disclosure.\nI:H - After the drain kfree, the holder still writes cpntf_time and later nfs4_put_cpntf_state runs _free_cpntf_state_locked on the freed object, a use-after-free write primitive usable for controlled memory modification and control-flow hijacking.\nA:H - The KASAN-detectable use-after-free at nfs4_put_cpntf_state oopses or panics nfsd worker threads, fully disrupting availability of the NFS server host."
            }
          ]
        }
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        "dateUpdated": "2026-09-14T12:01:53.477Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5f00e0ab4de45d4f9e4bd0883cf2517acf63fc0d"
        },
        {
          "url": "https://git.kernel.org/stable/c/06a62f6dbc60791f4229c6950b1eec6b18df9af1"
        },
        {
          "url": "https://git.kernel.org/stable/c/a1fca0f7bbb7b100a39c7ba8dd7922c87c4237a3"
        },
        {
          "url": "https://git.kernel.org/stable/c/caddbeffab1eaba1d2bcf5ceda35547863466705"
        },
        {
          "url": "https://git.kernel.org/stable/c/6b8149448cdcb476fba4559d1ecc247efee9971b"
        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/ff8a3cff02b92b2a82f1a9876038fcf953ae9c25"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b0c3595db99bb4bebd7c8aa8a36f3c50e411bb7"
        }
      ],
      "title": "nfsd: revoke copy-notify stateids before dropping their reference",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89663",
    "datePublished": "2026-09-11T19:45:50.577Z",
    "dateReserved": "2026-09-11T19:38:34.744Z",
    "dateUpdated": "2026-09-14T12:01:53.477Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89663",
      "date": "2026-09-15",
      "epss": "0.00455",
      "percentile": "0.384"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-15T01:45:50.000Z",
      "cve": "CVE-2026-89663",
      "id": "msrc_CVE-2026-89663",
      "initial_release_date": "2026-09-13T01:10:35.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "nfsd: revoke copy-notify stateids before dropping their reference",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89663.json",
      "version": "3"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89663\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:19:52.653\",\"lastModified\":\"2026-09-14T13:19:18.533\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnfsd: revoke copy-notify stateids before dropping their reference\\n\\nCopy-notify stateids live in the s2s_cp_stateids IDR and on their parent\\nstid\u0027s sc_cp_list, pinned by a single membership reference.\\n_free_cpntf_state_locked() only unlinks an entry once its refcount reaches\\nzero, so any revoke path that runs while a concurrent\\nfind_cpntf_state()/manage_cpntf_state() holder has elevated cs_count drops\\nthe reference without unlinking, leaving the entry discoverable with its\\nmembership reference already consumed. A second revoke or a laundromat tick\\nthen frees it while the reader still holds the pointer -- a\\nKASAN-detectable use-after-free at the reader\u0027s nfs4_put_cpntf_state().\\n\\nThis affected all three revoke paths:\\n\\n  - The parent-stid drain (nfs4_free_cpntf_statelist()) repeatedly called\\n    _free_cpntf_state_locked() on the first list entry; a holder that had\\n    bumped cs_count made it return early, so the next iteration\\n    re-decremented and burned the holder\u0027s reference.\\n\\n  - OFFLOAD_CANCEL (manage_cpntf_state()) and laundromat expiry likewise\\n    used _free_cpntf_state_locked() and could drop 2-\u003e1 without unlinking.\\n\\nAdd revoke_cpntf_state_locked(), which unhashes the entry from the IDR and\\nsc_cp_list first (deferring the final free to any holder), and use it from\\nall three revoke paths. The drain now walks with list_for_each_entry_safe()\\nand revokes each entry unconditionally, so it terminates in one pass per\\nentry regardless of cs_count. The unhash is gated on\\n!list_empty(\u0026cps-\u003ecp_list); the idr_remove() gate matters because\\nidr_alloc_cyclic() may have recycled the so_id by then. Keep\\n_free_cpntf_state_locked() for the reference-holder put path only, where a\\nconcurrent revoke may already have unlinked the entry (its list_del_init()\\nthen a no-op).\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/nfsd/nfs4state.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"624322f1adc58acd0b69f77a6ddc764207e97241\",\"lessThan\":\"5f00e0ab4de45d4f9e4bd0883cf2517acf63fc0d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"624322f1adc58acd0b69f77a6ddc764207e97241\",\"lessThan\":\"06a62f6dbc60791f4229c6950b1eec6b18df9af1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"624322f1adc58acd0b69f77a6ddc764207e97241\",\"lessThan\":\"a1fca0f7bbb7b100a39c7ba8dd7922c87c4237a3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"624322f1adc58acd0b69f77a6ddc764207e97241\",\"lessThan\":\"caddbeffab1eaba1d2bcf5ceda35547863466705\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"624322f1adc58acd0b69f77a6ddc764207e97241\",\"lessThan\":\"6b8149448cdcb476fba4559d1ecc247efee9971b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"624322f1adc58acd0b69f77a6ddc764207e97241\",\"lessThan\":\"b56d2c5f01cddbeca7d11cce81d97db4ec9a464f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"624322f1adc58acd0b69f77a6ddc764207e97241\",\"lessThan\":\"ff8a3cff02b92b2a82f1a9876038fcf953ae9c25\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"624322f1adc58acd0b69f77a6ddc764207e97241\",\"lessThan\":\"3b0c3595db99bb4bebd7c8aa8a36f3c50e411bb7\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"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:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/06a62f6dbc60791f4229c6950b1eec6b18df9af1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3b0c3595db99bb4bebd7c8aa8a36f3c50e411bb7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5f00e0ab4de45d4f9e4bd0883cf2517acf63fc0d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6b8149448cdcb476fba4559d1ecc247efee9971b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a1fca0f7bbb7b100a39c7ba8dd7922c87c4237a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b56d2c5f01cddbeca7d11cce81d97db4ec9a464f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/caddbeffab1eaba1d2bcf5ceda35547863466705\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ff8a3cff02b92b2a82f1a9876038fcf953ae9c25\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-13T06:51:29+00:00",
      "cve": "CVE-2026-89663",
      "id": "CVE-2026-89663",
      "initial_release_date": "2026-09-11T19:45:50.577000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel (nfsd): Use-after-free vulnerability in copy-notify stateid revocation.",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89663.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-16T00:00:48Z",
      "cve": "CVE-2026-89663",
      "id": "CVE-2026-89663",
      "initial_release_date": "2026-09-12T16:24:04Z",
      "product_status:known_affected": "210",
      "product_status:known_not_affected": "143",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89663",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89663.json",
      "version": "4"
    }
  }
}



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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.