Dashboard / CVE-2026-63940

CVE-2026-63940

CRITICAL
INFO Priority: 0.02 BB Relevance: 54/100
Published: 2026-07-19 Modified: 2026-10-28 First seen: 2026-10-29 Status: active

Attack Surface

Low Complexity No Auth No Interaction Conf. Impact Integ. Impact Scope Change

CVSS Vector Breakdown

AV: Local
AC: Low
PR: None
UI: None
S: Changed
C: High
I: High
A: High

Description

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.

Weakness Classification (2)

Affected Software (6)

VendorProductVersion
linux linux_kernel 5.11 – 6.6.160
linux linux_kernel 7.1
linux linux_kernel 7.1
linux linux_kernel 7.1
linux linux_kernel 7.1
linux linux_kernel 7.1

References & Advisories (5)

Bug Bounty Relevance

54 / 100
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

9.3 / 10.0 v3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS — Exploitation Probability

0.19%
Raw Score 0.001860
Percentile 8.2%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00186
2026-10-28
0.00186

Intelligence Sources

nvd ref →

External Links