CVE•Published 2026-07-19•Modified 2026-07-27•1 article on news•5 live references•NVD data
CVE-2026-63940
Vulnerability data via NVD (ingested)
CVSS v3.1
9.3
CRITICAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS percentile
8
Exploit Prediction Scoring System · top 92% of all CVEs
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.
Timeline
Published 2026-07-19
Modified 2026-07-27
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
More intel sources (5)
Shodan report
vuln:CVE-2026-63940Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-63940Censys host search filtered to this CVE id.
grep.app
CVE-2026-63940Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-63940GitHub code search for direct mentions.
Google dork
"CVE-2026-63940" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-63940 on GitHub.