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CVE-2026-89559

Full vulnerability record from the local CVENow database.

Description

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().

Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-11 20:19:39.673000
Last modified
2026-10-19 09:17:51.470000
View original CVE JSON 
{
  "id": "CVE-2026-89559",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-11T20:19:39.673",
  "lastModified": "2026-10-19T09:17:51.470",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibnvdimm/labels: Prevent integer overflow in __nd_label_validate()\n\nThe on-media namespace index field nslot is a u32 read from the DIMM\nlabel storage area.  __nd_label_validate() bounds it against the config\narea size, but sizeof_namespace_label() returns unsigned, so the product\nnslot * label_size is evaluated in 32-bit and wraps modulo 2^32 before\nthe comparison.  A crafted nslot passes the bound and is then used as the\nloop trip count in nd_label_data_init(), whose memset() walks off the end\nof the config_size buffer: an out-of-bounds write.\n\nThe field is not trusted -- it comes from the medium, or from userspace\nvia ND_CMD_SET_CONFIG_DATA.  Evaluate the product in 64-bit so the bound\ncheck is exact; conforming labels are unaffected.\n\nThe check was safe when introduced by commit 4a826c83db4e (\"libnvdimm:\nnamespace indices: read and validate\"): it multiplied by sizeof(struct\nnd_namespace_label), a size_t, so on a 64-bit build the product did not\nwrap.  Commit 564e871aa66f (\"libnvdimm, label: add v1.2 nvdimm label\ndefinitions\") narrowed it to 32 bits when the label size became a runtime\nvalue read via sizeof_namespace_label()."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/nvdimm/label.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "564e871aa66f548a947b23808d3140f326381f0c",
              "lessThan": "b4975f2ff6c82adc24ae547f029f82530ba43cfe",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "564e871aa66f548a947b23808d3140f326381f0c",
              "lessThan": "6030597ec683d1e5b46445f888bb5c7776b5a0c4",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "564e871aa66f548a947b23808d3140f326381f0c",
              "lessThan": "1c391696d2791f82ae462e11da9a0d96f90b240c",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "564e871aa66f548a947b23808d3140f326381f0c",
              "lessThan": "93967bfb17dab66642c57e609c99e1a91fe11278",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "564e871aa66f548a947b23808d3140f326381f0c",
              "lessThan": "e057efcc9c71d90099d9ee00bed0748d0e9fd586",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "564e871aa66f548a947b23808d3140f326381f0c",
              "lessThan": "09e649117c54b7e1c004f22eaa19efbadd9ac856",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "564e871aa66f548a947b23808d3140f326381f0c",
              "lessThan": "69a734359639fca16a0dd73ab17a34943e76c68b",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "564e871aa66f548a947b23808d3140f326381f0c",
              "lessThan": "037770686126155eafc44501312989e2837b9659",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/nvdimm/label.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "4.13",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "4.13",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.270",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.221",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.188",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.157",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.109",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.50",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.4",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-16T19:24:09.691777Z",
          "id": "CVE-2026-89559",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/037770686126155eafc44501312989e2837b9659",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/09e649117c54b7e1c004f22eaa19efbadd9ac856",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1c391696d2791f82ae462e11da9a0d96f90b240c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "url": "https://git.kernel.org/stable/c/6030597ec683d1e5b46445f888bb5c7776b5a0c4",
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    },
    {
      "url": "https://git.kernel.org/stable/c/b4975f2ff6c82adc24ae547f029f82530ba43cfe",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}