CVE-2026-89559

Status: UPDATED  |  Advisory ID: CVE-2026-89559

Key Details

Affected Products, Subsystems & Sectors

What to Know

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(). (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References