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.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.002.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
291bd20d5d88814a73d43b55b9428feab2f28094 affected < 3b6035bc6bff20e89752ce4358bc4c9a9d5883f2
291bd20d5d88814a73d43b55b9428feab2f28094 affected < 2254972d4d69e279ba4e87bf0968eb08ad0d3c92
291bd20d5d88814a73d43b55b9428feab2f28094 affected < c30cde934c7813b4e3069765dac64ce3d31e34f2
291bd20d5d88814a73d43b55b9428feab2f28094 affected < 3988bd2723de407ae90fa7a6f6029b4e60238c58
Linux Linux affected
Version Status Constraints
5.11 affected —
0 unaffected < 5.11
6.12.95 unaffected ≤ 6.12.*
6.18.35 unaffected ≤ 6.18.*
7.0.12 unaffected ≤ 7.0.*
7.1 unaffected ≤ *

No data.

No data.

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/2254972d4d69e279ba4e87bf0968eb08ad0d3c92 cve-icon
https://git.kernel.org/stable/c/3988bd2723de407ae90fa7a6f6029b4e60238c58 cve-icon
https://git.kernel.org/stable/c/3b6035bc6bff20e89752ce4358bc4c9a9d5883f2 cve-icon
https://git.kernel.org/stable/c/c30cde934c7813b4e3069765dac64ce3d31e34f2 cve-icon
History

Mon, 20 Jul 2026 14:45:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'}

Sun, 19 Jul 2026 15:30:00 +0000

Type Values Removed Values Added
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.
Title KVM: SEV: Ignore Port I/O requests of length '0'
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-07-20T13:41:42.039Z

Reserved: 2026-07-19T07:54:57.022Z

Link: CVE-2026-63940

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-21T05:30:16Z

Weaknesses

No weakness.