CVE-2026-99176: Linux kernel · KVM: nVMX: Reset MMU back to the root MMU if loading L2 state fails for !VM-Entry
Source GCVE Database
Not known to be exploited · fixed in d00d5f534a8238674755e59826a6c7d3c8efb870 : update Linux kernel when convenient.
Data as of 28 Oct 2026, 13:47 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
- Patch
- Available – fixed in d00d5f534a8238674755e59826a6c7d3c8efb870, c9716f956216eb74ab0aad7f633586edd49e0322, c8f4cfe1cf93bce924e27f2abead7a4c4a487505
Exploitation evidence
Disclosed: evidence found.
CVE published 28 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 d00d5f534a8238674755e59826a6c7d3c8efb870, c9716f956216eb74ab0aad7f633586edd49e0322 or c8f4cfe1cf93bce924e27f2abead7a4c4a487505.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | 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.
AI-suggested
A fix has been implemented in the Linux kernel to reset the MMU pointer back to the root MMU if loading the L2 state fails for non-VM-Entry cases. Users should apply the relevant kernel updates containing this fix once available. Patch status is not explicitly confirmed in the provided data; check the vendor advisory for current remediation guidance.
Description
A vulnerability in the Linux kernel's KVM nVMX module could cause a kernel NULL pointer dereference when the MMU pointer is not reset properly after a failure loading L2 state for non-VM-Entry cases. This can lead to a kernel crash (oops) due to dereferencing freed nested MMU state.
References
- nvd.nist.gov/vuln/detail/CVE-2026-99176 (opens in a new tab)
- git.kernel.org/stable/c/c8f4cfe1cf93bce924e27f2abead7a4c4a487505 (opens in a new tab)
- git.kernel.org/stable/c/c9716f956216eb74ab0aad7f633586edd49e0322 (opens in a new tab)
- git.kernel.org/stable/c/d00d5f534a8238674755e59826a6c7d3c8efb870 (opens in a new tab)