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CVE-2026-63940

Last refreshed2026-10-17

Status: UPDATED  |  Advisory ID: CVE-2026-63940

Key Details

CVECVE-2026-63940
CVSS Score / Version
9.3 (Critical) / CVSS v3.1
Updated2026-10-16
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS Prose
attack vector is local; attack complexity is low; privileges required is none; user interaction is none; scope is changed; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products
Linux Kernel

Affected Products, Subsystems & Sectors

VendorProductAffected VersionsPatch Status
LinuxLinux Kernel
SubsystemsOT Supporting Infrastructure
SectorsAll Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

KVM: SEV: Ignore Port I/O requests of length '0'

Explicitly ignore Port I/O requests of length '0' (or count '0'), so that

setting up the software scratch area (and other code) doesn't have to

worry about underflowing the length, and to allow for WARNing on trying

to configure the scratch area with len==0.

What to Do

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

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-63940
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-63940

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