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nfsd: initialize copy-notify stateid before publishing it

Type: advisorySource: Official CVE List1 source record

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.

Announced Group revision 1
Original source ↗

CVE-2026-89669

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89669

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "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"
      }
    ],
    "programFiles": [
      "fs/nfsd/nfs4proc.c",
      "fs/nfsd/nfs4state.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/nfsd/nfs4proc.c",
      "fs/nfsd/nfs4state.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89669

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#35160 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-89669 · Revision 1Source updated