CVE-2026-98390
Description
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. ]
How to fix
- Linux Linux9273a90465d58b82aca4bea71451ef6bee084928, 94e984d8858a3228952b02f84e66610961098cc2, 72bd92bd8190d7869ecb462649ca40f297822a33, 6.18 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 0a4b61d9c2e496b5f0a10e29e355a1465c8738bb ≤ v < 9273a90465d58b82aca4bea71451ef6bee084928, 0a4b61d9c2e496b5f0a10e29e355a1465c8738bb ≤ v < 94e984d8858a3228952b02f84e66610961098cc2, 0a4b61d9c2e496b5f0a10e29e355a1465c8738bb ≤ v < 72bd92bd8190d7869ecb462649ca40f297822a33, c4ad899a33198ab6335732c769835d035e66894a, 6.17.8 ≤ v < 6.18, 6.18 | 9273a90465d58b82aca4bea71451ef6bee084928, 94e984d8858a3228952b02f84e66610961098cc2, 72bd92bd8190d7869ecb462649ca40f297822a33, 6.18 |
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