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libnvdimm/labels: Prevent integer overflow in __nd_label_validate()

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: libnvdimm/labels: Prevent integer overflow in __nd_label_validate() The on-media namespace index field nslot is a u32 read from the DIMM label storage area. __nd_label_validate() bounds it against the config area size, but sizeof_namespace_label() returns unsigned, so the product nslot * label_size is evaluated in 32-bit and wraps modulo 2^32 before the comparison. A crafted nslot passes the bound and is then used as the loop trip count in nd_label_data_init(), whose memset() walks off the end of the config_size buffer: an out-of-bounds write. The field is not trusted -- it comes from the medium, or from userspace via ND_CMD_SET_CONFIG_DATA. Evaluate the product in 64-bit so the bound check is exact; conforming labels are unaffected. The check was safe when introduced by commit 4a826c83db4e ("libnvdimm: namespace indices: read and validate"): it multiplied by sizeof(struct nd_namespace_label), a size_t, so on a 64-bit build the product did not wrap. Commit 564e871aa66f ("libnvdimm, label: add v1.2 nvdimm label definitions") narrowed it to 32 bits when the label size became a runtime value read via sizeof_namespace_label().

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.270, 5.15.221, 6.1.188, 6.12.109, 6.18.50, 6.6.157, 7.2.4
CVEs
CVE-2026-89559
Confirmed fixed CVEs
Not specified
Updated in this feed
8 Nov 2026, 01:36 UTC · Revision 1

Source evidence

libnvdimm/labels: Prevent integer overflow in __nd_label_validate()

core-osv · Original source

Published 11 Sept 2026, 19:44 UTC

In the Linux kernel, the following vulnerability has been resolved: libnvdimm/labels: Prevent integer overflow in __nd_label_validate() The on-media namespace index field nslot is a u32 read from the DIMM label storage area. __nd_label_validate() bounds it against the config area size, but sizeof_namespace_label() returns unsigned, so the product nslot * label_size is evaluated in 32-bit and wraps modulo 2^32 before the comparison. A crafted nslot passes the bound and is then used as the loop trip count in nd_label_data_init(), whose memset() walks off the end of the config_size buffer: an out-of-bounds write. The field is not trusted -- it comes from the medium, or from userspace via ND_CMD_SET_CONFIG_DATA. Evaluate the product in 64-bit so the bound check is exact; conforming labels are unaffected. The check was safe when introduced by commit 4a826c83db4e ("libnvdimm: namespace indices: read and validate"): it multiplied by sizeof(struct nd_namespace_label), a size_t, so on a 64-bit build the product did not wrap. Commit 564e871aa66f ("libnvdimm, label: add v1.2 nvdimm label definitions") narrowed it to 32 bits when the label size became a runtime value read via sizeof_namespace_label().

osv:CVE-2026-89559

Kernel

Fixed versions: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4

Complete source record
{
  "id": "f5ad93417d8dd8b7442e1d871dc907bd90f0bbee53b537a8475e03c645fc9768",
  "url": "https://osv.dev/vulnerability/CVE-2026-89559",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "libnvdimm/labels: Prevent integer overflow in __nd_label_validate()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: libnvdimm/labels: Prevent integer overflow in __nd_label_validate() The on-media namespace index field nslot is a u32 read from the DIMM label storage area. __nd_label_validate() bounds it against the config area size, but sizeof_namespace_label() returns unsigned, so the product nslot * label_size is evaluated in 32-bit and wraps modulo 2^32 before the comparison. A crafted nslot passes the bound and is then used as the loop trip count in nd_label_data_init(), whose memset() walks off the end of the config_size buffer: an out-of-bounds write. The field is not trusted -- it comes from the medium, or from userspace via ND_CMD_SET_CONFIG_DATA. Evaluate the product in 64-bit so the bound check is exact; conforming labels are unaffected. The check was safe when introduced by commit 4a826c83db4e (\"libnvdimm: namespace indices: read and validate\"): it multiplied by sizeof(struct nd_namespace_label), a size_t, so on a 64-bit build the product did not wrap. Commit 564e871aa66f (\"libnvdimm, label: add v1.2 nvdimm label definitions\") narrowed it to 32 bits when the label size became a runtime value read via sizeof_namespace_label().",
    "evidence": "osv:CVE-2026-89559",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "5.10.270",
            "evidence": "/affected/1/ranges"
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          {
            "value": "5.15.221",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.188",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.109",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.50",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-89559",
      "aliases": [
        "CVE-2026-89559"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "6030597ec683d1e5b46445f888bb5c7776b5a0c4"
                },
                {
                  "fixed": "1c391696d2791f82ae462e11da9a0d96f90b240c"
                },
                {
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                {
                  "fixed": "e057efcc9c71d90099d9ee00bed0748d0e9fd586"
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                {
                  "fixed": "09e649117c54b7e1c004f22eaa19efbadd9ac856"
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                {
                  "fixed": "69a734359639fca16a0dd73ab17a34943e76c68b"
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                {
                  "fixed": "037770686126155eafc44501312989e2837b9659"
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89559.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.13.0"
                },
                {
                  "fixed": "5.10.270"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.221"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.7.0"
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                {
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              ]
            },
            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "6.13.0"
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                {
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            {
              "type": "ECOSYSTEM",
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89559.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.498281625Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/037770686126155eafc44501312989e2837b9659",
        "https://git.kernel.org/stable/c/09e649117c54b7e1c004f22eaa19efbadd9ac856",
        "https://git.kernel.org/stable/c/1c391696d2791f82ae462e11da9a0d96f90b240c",
        "https://git.kernel.org/stable/c/6030597ec683d1e5b46445f888bb5c7776b5a0c4",
        "https://git.kernel.org/stable/c/69a734359639fca16a0dd73ab17a34943e76c68b",
        "https://git.kernel.org/stable/c/93967bfb17dab66642c57e609c99e1a91fe11278",
        "https://git.kernel.org/stable/c/b4975f2ff6c82adc24ae547f029f82530ba43cfe",
        "https://git.kernel.org/stable/c/e057efcc9c71d90099d9ee00bed0748d0e9fd586",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89559.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89559",
        "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/2026/89xxx/CVE-2026-89559.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89559",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521402,
  "published_at": "2026-09-11T19:44:31.337+00:00"
}