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nfsd: fix cpntf publish race in nfs4_init_cp_state

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: nfsd: fix cpntf publish race in nfs4_init_cp_state nfs4_alloc_init_cpntf_state() published the new cpntf entry into the s2s_cp_stateids IDR (with cs_type set) in one s2s_cp_lock section, then took the lock again to list_add() it onto p_stid->sc_cp_list. In the gap the entry is reachable by so_id but cp_list is still {NULL,NULL} from kzalloc. A racing OFFLOAD_CANCEL (so_id is echoed to the client as cnr_stateid, so any NFSv4.2 client can drive it) reaches manage_cpntf_state() -> _free_cpntf_state_locked() and does list_del() on the zeroed list_head, oopsing the server. Fold the cs_type assignment and the list_add() into the same critical section as idr_alloc_cyclic(), so a concurrent lookup either misses the entry or sees a fully linked cp_list. INIT_LIST_HEAD() the entry after allocation and switch _free_cpntf_state_locked() to list_del_init() so a stale unlink is a no-op. nfs4_init_copy_state() passes NULL p_stid and skips the list_add, preserving NFS4_COPY_STID semantics.

Announced Source revision 1
Original source ↗

CVE-2026-89684

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-2026-89684

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": "63e18fc65587fd3f7b4c6d70e96d32fc41d82ba3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "624322f1adc58acd0b69f77a6ddc764207e97241",
        "lessThan": "6ac469a274e3c7d87fc46ba46d83b95009680407",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "624322f1adc58acd0b69f77a6ddc764207e97241",
        "lessThan": "8eeca993357a0bc35aaefebfd7462ac7b0a21d9a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "624322f1adc58acd0b69f77a6ddc764207e97241",
        "lessThan": "bfeac42d9074e539bacd1898dd8c14b7f5776620",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "624322f1adc58acd0b69f77a6ddc764207e97241",
        "lessThan": "21d6c5957f5ca97d7352e60f55ea412beb9419f5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "624322f1adc58acd0b69f77a6ddc764207e97241",
        "lessThan": "a631a26a8777bb235eabd478bbbaf26a4db750bf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "624322f1adc58acd0b69f77a6ddc764207e97241",
        "lessThan": "c7270f62e7a05a2ee68aa2b74262b658a14463bd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "624322f1adc58acd0b69f77a6ddc764207e97241",
        "lessThan": "be3a5c1d857b0dcbc11796cea603ef25834f75b2",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "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/nfs4state.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89684

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#35171 · Revision 1
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Publisher date
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