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CVE-2026-99178VulnerabilityPublished

Microsoft · x86/kvm: Don't consume async #PF flags on a kernel #PF in NMI context

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99178· High

Not known to be exploited · fixed in f45ee1ff6358a22d7e22a4c53cb3148ea97b10d9 : patch Microsoft soon.

Data as of 29 Oct 2026, 11:35 UTC

Severity
High

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

  1. Disclosed: evidence found.

    CVE published 28 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
LinuxLinuxAffected
  • <6.18.59
  • <7.2.13
Fixed in
  • f45ee1ff6358a22d7e22a4c53cb3148ea97b10d9
  • b77e9622bbade9812e2090c66d25c372f515e921
  • 81d99abe2bd81379abfb595e403bbbee6fbfc624
  • 7.2.13
  • 6.18.59
Debiandebian/linuxpkg:deb/debian/linuxOther threatsAffected
  • <6.18.59
  • <7.2.13
Fixed in
  • 6.18.59
  • 7.2.13

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.

References

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