x86/amd_node: Avoid divide by zero on virtualized systems

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Summary

CVECVE-2026-98390
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-14 14:17:49 UTC
Updated2026-10-19 10:18:42 UTC
DescriptionIn 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. ]

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0a4b61d9c2e496b5f0a10e29e355a1465c8738bb 9273a90465d58b82aca4bea71451ef6bee084928 git Not specified
CNA Linux Linux affected 0a4b61d9c2e496b5f0a10e29e355a1465c8738bb 94e984d8858a3228952b02f84e66610961098cc2 git Not specified
CNA Linux Linux affected 0a4b61d9c2e496b5f0a10e29e355a1465c8738bb 72bd92bd8190d7869ecb462649ca40f297822a33 git Not specified
CNA Linux Linux affected c4ad899a33198ab6335732c769835d035e66894a git Not specified
CNA Linux Linux affected 6.17.8 6.18 semver Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9273a90465d58b82aca4bea71451ef6bee084928 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/72bd92bd8190d7869ecb462649ca40f297822a33 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/94e984d8858a3228952b02f84e66610961098cc2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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