CVE-2026-98390 is a vulnerability in Linux Kernel
Published on October 14, 2026
x86/amd_node: Avoid divide by zero on virtualized systems
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. ]
Products Associated with CVE-2026-98390
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Affected Versions
Linux:- Version 0a4b61d9c2e496b5f0a10e29e355a1465c8738bb and below 9273a90465d58b82aca4bea71451ef6bee084928 is affected.
- Version 0a4b61d9c2e496b5f0a10e29e355a1465c8738bb and below 94e984d8858a3228952b02f84e66610961098cc2 is affected.
- Version 0a4b61d9c2e496b5f0a10e29e355a1465c8738bb and below 72bd92bd8190d7869ecb462649ca40f297822a33 is affected.
- Version c4ad899a33198ab6335732c769835d035e66894a is affected.
- Version 6.17.8 and below 6.18 is affected.
- Version 6.18 is affected.
- Before 6.18 is unaffected.
- Version 6.18.53, <= 6.18.* is unaffected.
- Version 7.2.7, <= 7.2.* is unaffected.
- Version 7.3-rc3, <= * is unaffected.