CVE-2026-98390: Linux kernel · x86/amd_node: Avoid divide by zero on virtualized systems
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in 9273a90465d58b82aca4bea71451ef6bee084928 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 12:55 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 9273a90465d58b82aca4bea71451ef6bee084928, 94e984d8858a3228952b02f84e66610961098cc2, 72bd92bd8190d7869ecb462649ca40f297822a33 +1
Exploitation evidence
Disclosed: evidence found.
CVE published 14 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade Linux kernel to 9273a90465d58b82aca4bea71451ef6bee084928, 94e984d8858a3228952b02f84e66610961098cc2, 72bd92bd8190d7869ecb462649ca40f297822a33 or 6.18.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
Upgrade to Linux kernel version 6.18 or later, where the issue is fixed. The fix sets roots_per_node to 1 to avoid divide-by-zero errors. No additional mitigation is required once patched.
Description
A divide-by-zero vulnerability in the Linux kernel's x86/amd_node topology code affects virtualized systems, particularly Xen PVH dom0. The flaw occurs because the calculation of roots_per_node can be zero, leading to a crash. This issue is fixed by setting roots_per_node to 1 in affected cases and logging a firmware bug for non-virtualized systems.