libnvdimm/labels: Prevent integer overflow in __nd_label_validate()

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-89559 · Microsoft / collected KEV context

cve-program · CVE-2026-89559

• https://git.kernel.org/stable/c/b4975f2ff6c82adc24ae547f029f82530ba43cfe
• https://git.kernel.org/stable/c/6030597ec683d1e5b46445f888bb5c7776b5a0c4
• https://git.kernel.org/stable/c/1c391696d2791f82ae462e11da9a0d96f90b240c
• https://git.kernel.org/stable/c/93967bfb17dab66642c57e609c99e1a91fe11278
• https://git.kernel.org/stable/c/e057efcc9c71d90099d9ee00bed0748d0e9fd586
• https://git.kernel.org/stable/c/09e649117c54b7e1c004f22eaa19efbadd9ac856
• https://git.kernel.org/stable/c/69a734359639fca16a0dd73ab17a34943e76c68b
• https://git.kernel.org/stable/c/037770686126155eafc44501312989e2837b9659

No related operational record is retained in the current change model.