GHSA-CP82-3R67-94RF
Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32In 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().
{
"affected": [],
"aliases": [
"CVE-2026-89559"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-11T20:19:39Z",
"severity": "HIGH"
},
"details": "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().",
"id": "GHSA-cp82-3r67-94rf",
"modified": "2026-09-14T15:32:29Z",
"published": "2026-09-11T21:31:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89559"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/037770686126155eafc44501312989e2837b9659"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/09e649117c54b7e1c004f22eaa19efbadd9ac856"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1c391696d2791f82ae462e11da9a0d96f90b240c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6030597ec683d1e5b46445f888bb5c7776b5a0c4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/69a734359639fca16a0dd73ab17a34943e76c68b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/93967bfb17dab66642c57e609c99e1a91fe11278"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b4975f2ff6c82adc24ae547f029f82530ba43cfe"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e057efcc9c71d90099d9ee00bed0748d0e9fd586"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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