libnvdimm/labels: Prevent integer overflow in __nd_label_validate()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89559
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:39 UTC
Updated2026-09-11 20:19:39 UTC
DescriptionIn 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().

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 564e871aa66f548a947b23808d3140f326381f0c e057efcc9c71d90099d9ee00bed0748d0e9fd586 git Not specified
CNA Linux Linux affected 564e871aa66f548a947b23808d3140f326381f0c 09e649117c54b7e1c004f22eaa19efbadd9ac856 git Not specified
CNA Linux Linux affected 564e871aa66f548a947b23808d3140f326381f0c 69a734359639fca16a0dd73ab17a34943e76c68b git Not specified
CNA Linux Linux affected 564e871aa66f548a947b23808d3140f326381f0c 037770686126155eafc44501312989e2837b9659 git Not specified
CNA Linux Linux affected 4.13 Not specified
CNA Linux Linux unaffected 4.13 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/69a734359639fca16a0dd73ab17a34943e76c68b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/037770686126155eafc44501312989e2837b9659 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e057efcc9c71d90099d9ee00bed0748d0e9fd586 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/09e649117c54b7e1c004f22eaa19efbadd9ac856 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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