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. ]
CVE-2026-98390
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98390
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "0a4b61d9c2e496b5f0a10e29e355a1465c8738bb",
"lessThan": "9273a90465d58b82aca4bea71451ef6bee084928",
"versionType": "git"
},
{
"status": "affected",
"version": "0a4b61d9c2e496b5f0a10e29e355a1465c8738bb",
"lessThan": "94e984d8858a3228952b02f84e66610961098cc2",
"versionType": "git"
},
{
"status": "affected",
"version": "0a4b61d9c2e496b5f0a10e29e355a1465c8738bb",
"lessThan": "72bd92bd8190d7869ecb462649ca40f297822a33",
"versionType": "git"
},
{
"status": "affected",
"version": "c4ad899a33198ab6335732c769835d035e66894a",
"versionType": "git"
},
{
"status": "affected",
"version": "6.17.8",
"lessThan": "6.18",
"versionType": "semver"
}
],
"programFiles": [
"arch/x86/kernel/amd_node.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/x86/kernel/amd_node.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98390
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38457 · Revision 1
- Added to Heist Feed
- Publisher date