CVE-2026-63940
CRITICAL severity · CVSS 9.3 · CWE-191
9.3CVSS CRITICAL
Summary
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.
Impact & exploitability
Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://git.kernel.org/stable/c/2254972d4d69e279ba4e87bf0968eb08ad0d3c92 ↗
Additional information
- NVD record
- https://git.kernel.org/stable/c/2254972d4d69e279ba4e87bf0968eb08ad0d3c92Patch
- https://git.kernel.org/stable/c/3988bd2723de407ae90fa7a6f6029b4e60238c58Patch
- https://git.kernel.org/stable/c/3b6035bc6bff20e89752ce4358bc4c9a9d5883f2Patch
- https://git.kernel.org/stable/c/bbd3a27e4f99fdcad82d12d79c04a95dff1ff70bPatch
- https://git.kernel.org/stable/c/c30cde934c7813b4e3069765dac64ce3d31e34f2Patch
- https://git.kernel.org/stable/c/c8aa0a79ab0b23cde4c46ccff78e63be35733e04