nfsd: return -EINVAL when namelen is 0

{
  "id": "e310493f731f071d8bb12f96d2b2f91549f3a5f15fa2068aa6654a2ca98b49ea",
  "url": "https://osv.dev/vulnerability/CVE-2024-47692",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "nfsd: return -EINVAL when namelen is 0",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: nfsd: return -EINVAL when namelen is 0 When we have a corrupted main.sqlite in /var/lib/nfs/nfsdcld/, it may result in namelen being 0, which will cause memdup_user() to return ZERO_SIZE_PTR. When we access the name.data that has been assigned the value of ZERO_SIZE_PTR in nfs4_client_to_reclaim(), null pointer dereference is triggered. [ T1205] ================================================================== [ T1205] BUG: KASAN: null-ptr-deref in nfs4_client_to_reclaim+0xe9/0x260 [ T1205] Read of size 1 at addr 0000000000000010 by task nfsdcld/1205 [ T1205] [ T1205] CPU: 11 PID: 1205 Comm: nfsdcld Not tainted 5.10.0-00003-g2c1423731b8d #406 [ T1205] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-buildvm-ppc64le-16.ppc.fedoraproject.org-3.fc31 04/01/2014 [ T1205] Call Trace: [ T1205] dump_stack+0x9a/0xd0 [ T1205] ? nfs4_client_to_reclaim+0xe9/0x260 [ T1205] __kasan_report.cold+0x34/0x84 [ T1205] ? nfs4_client_to_reclaim+0xe9/0x260 [ T1205] kasan_report+0x3a/0x50 [ T1205] nfs4_client_to_reclaim+0xe9/0x260 [ T1205] ? nfsd4_release_lockowner+0x410/0x410 [ T1205] cld_pipe_downcall+0x5ca/0x760 [ T1205] ? nfsd4_cld_tracking_exit+0x1d0/0x1d0 [ T1205] ? down_write_killable_nested+0x170/0x170 [ T1205] ? avc_policy_seqno+0x28/0x40 [ T1205] ? selinux_file_permission+0x1b4/0x1e0 [ T1205] rpc_pipe_write+0x84/0xb0 [ T1205] vfs_write+0x143/0x520 [ T1205] ksys_write+0xc9/0x170 [ T1205] ? __ia",
    "evidence": "osv:CVE-2024-47692",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.4.285",
            "evidence": "/affected/1/ranges"
          },
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            "value": "5.10.227",
            "evidence": "/affected/1/ranges"
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          {
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            "evidence": "/affected/1/ranges"
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          {
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            "evidence": "/affected/1/ranges"
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            "value": "6.6.54",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.10.13",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.11.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-47692",
      "aliases": [
        "CVE-2024-47692"
      ],
      "affected": [
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                {
                  "fixed": "0f1d007bbea38a61cf9c5392708dc70ae9d84a3d"
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                {
                  "fixed": "b7b7a8df41ef18862dd6b22289fb46c2c12398af"
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                {
                  "fixed": "84a563d136faf514fdad1ade28d7a142fd313cb8"
                },
                {
                  "fixed": "318f70857caab3da9a6ada9bc8c1f4f7591b695e"
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                  "fixed": "766d5fbd78f7a52b3888449a0358760477b74602"
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            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-47692.json"
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          "package": {
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:50.581421661Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-265688.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-355557.html",
        "https://git.kernel.org/stable/c/0f1d007bbea38a61cf9c5392708dc70ae9d84a3d",
        "https://git.kernel.org/stable/c/1ff8be8d008b9ddc8e7043fbddd37d5d451b271b",
        "https://git.kernel.org/stable/c/22451a16b7ab7debefce660672566be887db1637",
        "https://git.kernel.org/stable/c/318f70857caab3da9a6ada9bc8c1f4f7591b695e",
        "https://git.kernel.org/stable/c/6d07040ae5c2214e39c7444d898039c9e655a79a",
        "https://git.kernel.org/stable/c/766d5fbd78f7a52b3888449a0358760477b74602",
        "https://git.kernel.org/stable/c/84a563d136faf514fdad1ade28d7a142fd313cb8",
        "https://git.kernel.org/stable/c/b7b7a8df41ef18862dd6b22289fb46c2c12398af",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47692.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-47692",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47692.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-47692",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 518650,
  "published_at": "2024-10-21T11:53:31.238+00:00"
}