CVE-2026-46071
📛 CVE Title
KVM: nSVM: Avoid clearing VMCB_LBR in vmcb12
Description
In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Avoid clearing VMCB_LBR in vmcb12 svm_copy_lbrs() always marks VMCB_LBR dirty in the destination VMCB. However, nested_svm_vmexit() uses it to copy LBRs to vmcb12, and clearing clean bits in vmcb12 is not architecturally defined. Move vmcb_mark_dirty() to callers and drop it for vmcb12. This also facilitates incoming refactoring that does not pass the entire VMCB to svm_copy_lbrs().
Overview
- State
- PUBLISHED
- Assigner (CNA)
- Linux
- CVSS severity
- high
- CVSS score
- 7.1 / 10
- CVSS vector
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H- Effective score
- 7.1 / 10 HIGH source: CNA overview
- MSRC score
- 5.5 / 10 MEDIUM MS rating: Moderate
- CWE(s)
- —
- Reserved
- 2026-05-13
- Published
- 2026-05-27 12:57 UTC
- Last updated
- 2026-05-27 12:57 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/46xxx/CVE-2026-46071.json
- Linked Threat
- CVE-2026-46071 — CVE-2026-46071
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-05-27 14:17:28 UTC
- NVD last modified
- 2026-06-24 16:59:55 UTC
- NVD CVSS v3.1
- 5.5 / 10 MEDIUM source: nvd@nist.gov
- NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H- Exploitability subscore
- 1.8 / 10
- Impact subscore
- 3.6 / 10
- EPSS score
- 0.0012 (probability of exploitation in next 30 days)
- EPSS percentile
- 2.23% vs all CVEs — higher = more likely to be exploited, as of 2026-07-13
NVD / KEV / EPSS data refreshed 2026-07-13 17:04 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-32453 - Assigner
- Linux
- Published
- May 27, 2026, 12:57:57 PM
- Updated
- Jun 14, 2026, 5:52:10 PM
- EUVD base score
- 0.0 / 10
- EUVD-reported EPSS
- 0.1200
- Vendors
- Linux
- Products
-
Linux (patch: 6.18.27)Linux (d20c796ca3709801f8a7fa36e8770a3dd8ebd34e <a3f0981a5a0e0bd51ad74cc7d9eed32294b24002)Linux (patch: 7.1)Linux (patch: 7.0.4)Linux (patch: 0)Linux (d20c796ca3709801f8a7fa36e8770a3dd8ebd34e <b53ab5167a81537777ac780bbd93d32613aa3bda)Linux (d20c796ca3709801f8a7fa36e8770a3dd8ebd34e <9efe23568806d1cd06f7d146f9b3037b8d585a9f)Linux (patch: 7.1-rc1)Linux (5.19)
- Aliases
-
GHSA-h9fc-vq2v-qf62
ENISA description: In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Avoid clearing VMCB_LBR in vmcb12 svm_copy_lbrs() always marks VMCB_LBR dirty in the destination VMCB. However, nested_svm_vmexit() uses it to copy LBRs to vmcb12, and clearing clean bits in vmcb12 is not architecturally defined. Move vmcb_mark_dirty() to callers and drop it for vmcb12. This also facilitates incoming refactoring that does not pass the entire VMCB to svm_copy_lbrs().
Microsoft Security Response Center MSRC
Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-08-12 01:09 UTC (source: CVRF).
- MS severity
- Moderate
- MS CVSS base score
- 5.5 / 10 (temporal 5.5)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Release
- 2026-May
Affected products (2)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| Linux | Linux |
d20c796ca3709801f8a7fa36e8770a3dd8ebd34e (affected),
d20c796ca3709801f8a7fa36e8770a3dd8ebd34e (affected),
d20c796ca3709801f8a7fa36e8770a3dd8ebd34e (affected)
|
— |
| Linux | Linux |
5.19 (affected),
0 (unaffected),
6.18.27 (unaffected),
7.0.4 (unaffected),
7.1-rc1 (unaffected)
|
— |
Affected products — CPE 2.3 (1) NVD
NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendor references (3)
References embedded in the original CVE record by the assigning CNA.
Web references (7)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- MSRC update guide: CVE-2026-46071 msrc
- https://git.kernel.org/stable/c/a3f0981a5a0e0bd51ad74cc7d9eed32294b24002 tenable:git.kernel.org
- https://git.kernel.org/stable/c/b53ab5167a81537777ac780bbd93d32613aa3bda tenable:git.kernel.org
- https://git.kernel.org/stable/c/9efe23568806d1cd06f7d146f9b3037b8d585a9f tenable:git.kernel.org
- https://nvd.nist.gov/vuln/detail/CVE-2026-46071 tenable:nvd.nist.gov
- https://www.cve.org/CVERecord?id=CVE-2026-46071 tenable:www.cve.org
- https://www.first.org/epss/ tenable:www.first.org
NVD-tagged references (3)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://git.kernel.org/stable/c/9efe23568806d1cd06f7d146f9b3037b8d585a9f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
- https://git.kernel.org/stable/c/a3f0981a5a0e0bd51ad74cc7d9eed32294b24002 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
- https://git.kernel.org/stable/c/b53ab5167a81537777ac780bbd93d32613aa3bda 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
Remediations (20)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:blog.qualys.com
Key Takeaways RedSun is a critical zero-day vulnerability in Microsoft Defender that allows low-privileged users to gain SYSTEM access No patch is currently available, leaving all Defender-enabled Windows systems potentially exposed Qualys VMDR detects affected assets instantly (QID 92382) TruRisk™ Eliminate enables immediate mitigation , removing exploitability without waiting for a fix ...
2026-06-04 00:12 UTC -
web:cybersecuritynews.com
Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.
2026-06-04 00:12 UTC -
web:msrc.microsoft.com
The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.
2026-06-04 00:12 UTC -
web:nvd.nist.gov
An official website of the United States government Here's how you know
2026-06-04 00:12 UTC -
web:support.microsoft.com
Provides Windows client guidance for IT Pros to protect against speculative execution side-channel vulnerabilities.
2026-06-04 00:12 UTC -
web:thecyberexpress.com
Microsoft has rolled out its May 2026 Patch Tuesday security updates, delivering fixes for approximately 120 vulnerabilities across Windows, Microsoft Office, networking services, and enterprise platforms.
2026-06-04 00:12 UTC -
web:www.crowdstrike.com
Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.
2026-06-04 00:12 UTC -
web:www.helpnetsecurity.com
Microsoft has marked May 2026 Patch Tuesday by releasing fixes for 120+ CVE -numbered vulnerabilities, none of which are actively exploited.
2026-06-04 00:12 UTC -
web:www.rapid7.com
Microsoft is publishing 137 vulnerabilities on May 2026 Patch Tuesday, including critical RCE in Netlogon and the Windows DNS client.
2026-06-04 00:12 UTC -
web:www.techradar.com
Microsoft patches two actively exploited zero‑day flaws in Defender, tracked as CVE‑2026‑41091 (privilege escalation) and CVE‑2026‑45498 (denial of service) Updates were shipped ...
2026-06-04 00:12 UTC -
web:cybersecuritynews.com
CISA added CVE - 2026 -35273 to its KEV catalog on June 12, 2026 , with a remediation due date of June 15, 2026 , under Binding Operational Directive (BOD) 26-04. The directive emphasizes prioritizing security updates based on risk, particularly for vulnerabilities actively exploited in attacks.
2026-06-19 02:28 UTC -
web:support.microsoft.com
The following summary outlines key issues addressed by this update. The bold text within the brackets indicates the item or area of the change. [Networking] Fixed: This update addresses a security issue in the Windows Routing and Remote Access Service (RRAS) management tool. If you connect to a malicious remote server, an attacker could disrupt the tool or run code on your device. For more ...
2026-06-19 02:28 UTC -
web:support.sap.com
SAP security Patch Day Bulletin
2026-06-19 02:28 UTC -
web:www.cisa.gov
D. Verify the mitigation has worked, if possible. Scan the patched/mitigated asset with the tools and methods listed in step 1.B. Use more than one method to verify the mitigation was successfully applied.
2026-06-19 02:28 UTC -
web:www.computerworld.com
Microsoft says it is considering a patch for a zero-day vulnerability, dubbed YellowKey, that allows attackers with access to a Windows device to bypass Bitlocker encryption protection and read ...
2026-06-19 02:28 UTC -
web:www.esri.com
Scope - This vulnerability does NOT affect feature services utilizing only hosted feature layers. Mitigation - A Web Application Firewall (WAF) is strongly recommended for Internet-facing systems as described in the ArcGIS Enterprise Hardening Guide located within the ArcGIS Trust Center documents section.
2026-06-19 02:28 UTC -
web:www.forbes.com
Updated May 18: This article has been updated to include further details on the emergency mitigation process recommended by Microsoft after the CVE - 2026 -42897 Exchange Server zero-day was ...
2026-06-19 02:28 UTC -
web:www.malwarebytes.com
Microsoft says it's working on a fix for an unpatched Defender vulnerability that can give attackers the highest level of access on Windows.
2026-06-19 02:28 UTC -
web:www.oracle.com
This Critical Security Patch Update contains 35 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Security Patch Update and other Oracle Software Security Assurance activities is located at May 2026 Critical Security Patch Update: Executive Summary and Analysis.
2026-06-19 02:28 UTC -
web:www.veeam.com
When a vulnerability is identified, our team promptly develops a patch to address and mitigate the risk. In line with our dedication to transparency, we publicly disclose the vulnerability and provide detailed mitigation information.
2026-06-19 02:28 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-46071.json.
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/x86/kvm/svm/nested.c",
"arch/x86/kvm/svm/svm.c"
],
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{
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
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"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
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"cpeMatch": [
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nSVM: Avoid clearing VMCB_LBR in vmcb12\n\nsvm_copy_lbrs() always marks VMCB_LBR dirty in the destination VMCB.\nHowever, nested_svm_vmexit() uses it to copy LBRs to vmcb12, and\nclearing clean bits in vmcb12 is not architecturally defined.\n\nMove vmcb_mark_dirty() to callers and drop it for vmcb12.\n\nThis also facilitates incoming refactoring that does not pass the entire\nVMCB to svm_copy_lbrs()."
}
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},
{
"url": "https://git.kernel.org/stable/c/b53ab5167a81537777ac780bbd93d32613aa3bda"
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],
"title": "KVM: nSVM: Avoid clearing VMCB_LBR in vmcb12",
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"cveId": "CVE-2026-46071",
"datePublished": "2026-05-27T12:57:57.316Z",
"dateReserved": "2026-05-13T15:03:33.095Z",
"dateUpdated": "2026-05-27T12:57:57.316Z",
"state": "PUBLISHED"
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