CVE-2026-46076

High

In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1 Explicitly synthesize a #UD for VMMCALL if L2 is active, L1 does NOT want to intercept VMMCALL, nested_svm_l2_tlb_flush_enabled() is true, and the hypercall is something other than one of the supported Hyper-V hypercalls. When all of the above conditions are met, KVM will intercept VMMCALL but never forward it to L1, i.e. will let L2 make hypercalls as if it were L1. The TLFS says a whole lot of nothing about this scenario, so go with the architectural behavior, which says that VMMCALL #UDs if it's not intercepted. Opportunistically do a 2-for-1 stub trade by stub-ifying the new API instead of the helpers it uses. The last remaining "single" stub will soon be dropped as well. [sean: rewrite changelog and comment, tag for stable, remove defunct stubs]

Package Linux Kernel
Published 2026-05-27
Last modified 2026-05-30
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

7.9

out of 10
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

Affected versions

Linux kernel versions 6.2 and later are affected. Fixed in 6.12.86, 6.18.27, 7.0.4, 7.1-rc1 and their respective stable series.

Affected from
≥ 6.2
Fixed in
✓ 6.12.86 6.12.x ✓ 6.18.27 6.18.x ✓ 7.0.4 7.0.x ✓ 7.1-rc1

References

The following references provide additional information about CVE-2026-46076 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

4 patch commits total View all on NVD

Frequently asked questions

  • What is CVE-2026-46076?

    CVE-2026-46076 is a High severity Linux kernel vulnerability with a CVSS score of 7.9 out of 10 . It affects Linux kernel versions from 6.2 onward and has been patched in 6.12.86, 6.18.27, 7.0.4 and others. CVE-2026-46076 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2026-46076?

    CVE-2026-46076 has a CVSS score of 7.9 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H .

  • Is there a patch available for CVE-2026-46076?

    Yes — CVE-2026-46076 has been patched. Fixed versions include 6.12.86, 6.18.27, 7.0.4 and others. If you are running Linux kernel 6.2 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2026-46076 actively exploited?

    No — CVE-2026-46076 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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