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libnvdimm/labels: Prevent integer overflow in __nd_label_validate()

Type: advisorySource: Official CVE List1 source record

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().

Announced Source revision 1
Original source ↗

CVE-2026-89559

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-2026-89559

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": "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"
      }
    ],
    "programFiles": [
      "drivers/nvdimm/label.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.13",
        "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": [
      "drivers/nvdimm/label.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89559

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#35074 · Revision 1
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Publisher date
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