CVE-2026-46071VulnerabilityPublished 28 May 2026Updated 24 Sep 2026

vmcb12 · KVM: nSVM: Avoid clearing VMCB_LBR

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-46071

Not known to be exploited · fixed in b53ab5167a81537777ac780bbd93d32613aa3bda : update Microsoft when convenient.

Data as of 30 Oct 2026, 11:52 UTC

Severity

Medium

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

EPSS: 0.1% chance of exploitation in 30 days – higher than 1% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in b53ab5167a81537777ac780bbd93d32613aa3bda, b7fefb393a926bdfe445c63b4091185ed7da2733, a3f0981a5a0e0bd51ad74cc7d9eed32294b24002 +3

Exploitation evidence

Disclosed: evidence found.
CVE published 27 May 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 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

microsoft-security-response-ce

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d20c796ca3709801f8a7fa36e8770a3dd8ebd34e, < b53ab5167a81537777ac780bbd93d32613aa3bda	Fixed in b53ab5167a81537777ac780bbd93d32613aa3bda
LinuxLinux	Affected ≥ d20c796ca3709801f8a7fa36e8770a3dd8ebd34e, < b7fefb393a926bdfe445c63b4091185ed7da2733	Fixed in b7fefb393a926bdfe445c63b4091185ed7da2733
LinuxLinux	Affected ≥ d20c796ca3709801f8a7fa36e8770a3dd8ebd34e, < a3f0981a5a0e0bd51ad74cc7d9eed32294b24002	Fixed in a3f0981a5a0e0bd51ad74cc7d9eed32294b24002
LinuxLinux	Affected ≥ d20c796ca3709801f8a7fa36e8770a3dd8ebd34e, < 165b08d2d1346dce5ed43db65e10f3194b9ae2fe	Fixed in 165b08d2d1346dce5ed43db65e10f3194b9ae2fe
LinuxLinux	Affected ≥ d20c796ca3709801f8a7fa36e8770a3dd8ebd34e, < 11d347b7edf5093d69aca72317300798a32bfd6b	Fixed in 11d347b7edf5093d69aca72317300798a32bfd6b
LinuxLinux	Affected ≥ d20c796ca3709801f8a7fa36e8770a3dd8ebd34e, < 9efe23568806d1cd06f7d146f9b3037b8d585a9f	Fixed in 9efe23568806d1cd06f7d146f9b3037b8d585a9f

AI-suggested

No specific mitigation or workaround information is provided at this time.

Description

CVE-2026-46071 is a vulnerability related to KVM's handling of the VMCB_LBR field in vmcb12, as identified by the Microsoft Security Response Center. The provided description does not include technical details or impact specifics. There is no CVSS score assigned, and no known exploits in the wild have been reported. The vulnerability affects Microsoft products including Azure Linux 3.0.

Impact

The impact of this vulnerability is not clearly described in the provided information. There are no known exploits in the wild, and no CVSS score is assigned to quantify severity. Without further details, the potential consequences remain unclear.

Summary

This vulnerability concerns the KVM (Kernel-based Virtual Machine) component, specifically the nSVM feature and the handling of the VMCB_LBR field in vmcb12. The advisory lacks detailed technical information, and no CVSS score or exploit data is provided. The affected products include Microsoft and Azure Linux 3.0 versions.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 28 May 2026, 21:14 UTC

Technical details

References

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