Answer in brief
CVE-2026-89559 records a High severity (CVSS 7.8) vulnerability in libnvdimm/labels: Prevent integer overflow in __nd_label_validate(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=564e871aa66f548a947b23808d3140f326381f0c <e057efcc9c71d90099d9ee00bed0748d0e9fd586 || >=564e871aa66f548a947b23808d3140f326381f0c <09e649117c54b7e1c004f22eaa19efbadd9ac856 || >=564e871aa66f548a947b23808d3140f326381f0c <69a734359639fca16a0dd73ab17a34943e76c68b || >=564e871aa66f548a947b23808d3140f326381f0c <037770686126155eafc44501312989e2837b9659 | e057efcc9c71d90099d9ee00bed0748d0e9fd586, 09e649117c54b7e1c004f22eaa19efbadd9ac856, 69a734359639fca16a0dd73ab17a34943e76c68b, 037770686126155eafc44501312989e2837b9659 |
| Linux/Linuxgeneric | 4.13 | Not reported |
| Linux/Linuxgeneric | >=564e871aa66f548a947b23808d3140f326381f0c <b4975f2ff6c82adc24ae547f029f82530ba43cfe || >=564e871aa66f548a947b23808d3140f326381f0c <6030597ec683d1e5b46445f888bb5c7776b5a0c4 || >=564e871aa66f548a947b23808d3140f326381f0c <1c391696d2791f82ae462e11da9a0d96f90b240c || >=564e871aa66f548a947b23808d3140f326381f0c <93967bfb17dab66642c57e609c99e1a91fe11278 || >=564e871aa66f548a947b23808d3140f326381f0c <e057efcc9c71d90099d9ee00bed0748d0e9fd586 || >=564e871aa66f548a947b23808d3140f326381f0c <09e649117c54b7e1c004f22eaa19efbadd9ac856 || >=564e871aa66f548a947b23808d3140f326381f0c <69a734359639fca16a0dd73ab17a34943e76c68b || >=564e871aa66f548a947b23808d3140f326381f0c <037770686126155eafc44501312989e2837b9659 | b4975f2ff6c82adc24ae547f029f82530ba43cfe, 6030597ec683d1e5b46445f888bb5c7776b5a0c4, 1c391696d2791f82ae462e11da9a0d96f90b240c, 93967bfb17dab66642c57e609c99e1a91fe11278, e057efcc9c71d90099d9ee00bed0748d0e9fd586, 09e649117c54b7e1c004f22eaa19efbadd9ac856, 69a734359639fca16a0dd73ab17a34943e76c68b, 037770686126155eafc44501312989e2837b9659 |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
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().
Quoted source text, attributed separately from HOL analysis.