CVE-2026-89559
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel, __nd_label_validate() in libnvdimm/labels has an integer overflow. The nslot field (u32) is multiplied by the label size in 32-bit arithmetic, which can wrap around and bypass the bounds check, leading to an out-of-bounds write in nd_label_data_init().
Risk Assessment
This can lead to kernel memory corruption (out-of-bounds write), causing system crashes or potential code execution, especially when crafted NVDIMM labels are used.
Recommendation
Update the Linux kernel to a version where the product is evaluated in 64-bit, ensuring an exact bounds check.
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Original NVD description (English source)
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().
Vulnerability data from NVD (NIST) · CISA KEV · EPSS