Microsoft · x86/kvm: Don't consume async #PF flags on a kernel #PF in NMI context
Affects MicrosoftSource GCVE Database
Not known to be exploited · fixed in f45ee1ff6358a22d7e22a4c53cb3148ea97b10d9 : patch Microsoft soon.
Data as of 29 Oct 2026, 11:35 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Thin evidence
One scorer or none- Patch
- Available – fixed in f45ee1ff6358a22d7e22a4c53cb3148ea97b10d9, b77e9622bbade9812e2090c66d25c372f515e921, 81d99abe2bd81379abfb595e403bbbee6fbfc624 +2
Exploitation evidence
Disclosed: evidence found.
CVE published 28 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 29 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
Debiandebian/linuxpkg:deb/debian/linuxOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
This vulnerability, identified as CVE-2026-99178, involves the x86 KVM component where asynchronous page fault flags are improperly consumed during a kernel page fault in a non-maskable interrupt (NMI) context. The advisory does not provide detailed technical or impact information beyond this description.