CVE-2026-98390

In the Linux kernel, the following vulnerability has been resolved: x86/amd_node: Avoid divide by zero on virtualized systems On a virtualized system, the number of nodes does not have a relationship to the number of roots. A Xen PVH dom0 can calculate roots_per_node as 0, which crashes with a divide by zero in: if (count++ % roots_per_node) because the underlying topology code on Xen ends up making num_nodes 2 and num_roots 1 and the integer division result is 0. The issue is seen with Xen, but it could affect other systems. Set roots_per_node to 1 in this case. Print a firmware bug when this is performed for non-virtualized systems. [ bp: Massage commit message. ]

• git.kernel.orghttps://git.kernel.org/stable/c/72bd92bd8190d7869ecb462649ca40f297822a33
• git.kernel.orghttps://git.kernel.org/stable/c/9273a90465d58b82aca4bea71451ef6bee084928
• git.kernel.orghttps://git.kernel.org/stable/c/94e984d8858a3228952b02f84e66610961098cc2

No related CVEs by CWE or product.