CVE-2026-46076

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-46076

Key Details

CVE	CVE-2026-46076
CVSS Score / Version	7.9 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is changed; confidentiality impact is low; integrity impact is low; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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] (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-46076
CVE	https://www.cve.org/CVERecord?id=CVE-2026-46076

Source

Reference

NVD

CVE