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nfsd: release layout stid on setlease failure

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: nfsd: release layout stid on setlease failure nfs4_alloc_stid() publishes the new stid into cl->cl_stateids via idr_alloc_cyclic() under cl_lock before returning to nfsd4_alloc_layout_stateid(). When nfsd4_layout_setlease() then fails, the error path frees the layout stateid directly with kmem_cache_free() without ever calling idr_remove(), leaving the IDR slot pointing at freed slab memory. Any subsequent IDR walker (states_show, client teardown) dereferences the dangling pointer. The correct teardown for an IDR-published stid is nfs4_put_stid(), which removes the IDR slot under cl_lock, dispatches sc_free (nfsd4_free_layout_stateid) to release ls->ls_file via nfsd4_close_layout(), and drops the nfs4_file reference in its tail. A second issue blocks that switch: nfsd4_free_layout_stateid() unconditionally inspects ls->ls_fence_work via delayed_work_pending() under ls_lock, but INIT_DELAYED_WORK(&ls->ls_fence_work, ...) currently runs only after the setlease call. On the setlease-failure path the destructor would touch an uninitialized delayed_work. nfsd4_alloc_layout_stateid() nfs4_alloc_stid() /* idr_alloc_cyclic under cl_lock */ nfsd4_layout_setlease() /* fails */ nfs4_put_stid() nfsd4_free_layout_stateid() delayed_work_pending(&ls->ls_fence_work) /* needs INIT */ nfsd4_close_layout() /* nfsd_file_put(ls->ls_file) */ put_nfs4_file() Fix by hoisting the ls_fenced / ls_fence_delay / INIT_DELAYED_WORK initial

Announced Source revision 1
Original source ↗

CVE-2026-53399

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-2026-53399

Linux

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

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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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": "c5c707f96fc9a6e5a57ca5baac892673270abe3d",
        "lessThan": "d788ef40a7517d22c97ab01700e4ae4c611b6f2f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c5c707f96fc9a6e5a57ca5baac892673270abe3d",
        "lessThan": "2e0a5d6d62600b8c614d1b55e50ef94035d6adf9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c5c707f96fc9a6e5a57ca5baac892673270abe3d",
        "lessThan": "7bbb7ce74051c8be4b69ff44ce3db370600dae61",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c5c707f96fc9a6e5a57ca5baac892673270abe3d",
        "lessThan": "48a586e382e4db1dbf958d44b63e081df5f8ed04",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c5c707f96fc9a6e5a57ca5baac892673270abe3d",
        "lessThan": "d369e5edfaaf83a448016e2f1da392b2174be801",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c5c707f96fc9a6e5a57ca5baac892673270abe3d",
        "lessThan": "8dee7c278f1c2b5bb80e17a6281c3812fc8b0cdd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c5c707f96fc9a6e5a57ca5baac892673270abe3d",
        "lessThan": "83c2b7797742339bb768f83935f7ca33950db138",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c5c707f96fc9a6e5a57ca5baac892673270abe3d",
        "lessThan": "30d55c8aabb261bc3f427d6b9aae7ef6206063f9",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/nfsd/nfs4layouts.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.261",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.96",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.39",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.3",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/nfsd/nfs4layouts.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53399

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#40825 · Revision 1
Added to Heist Feed
Publisher date
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