Unspecified impact via direct fast PIO rerouting
Published Jul 30, 2026 · Updated Jul 30, 2026
Unspecified KVM behavior in Linux Kernel 4.10 through 5.19 allows attackers to cause unspecified impact via unspecified vectors. In arch/x86/kvm/x86.c, fast IN handling is rerouted directly through __emulator_pio_in because that helper now fills val for in-kernel PIO. The Linux CNA describes the change as a pure no-op with no intended functional change and publishes no exploitation gate, observable failure, or security consequence.
Summary
What happened
Unspecified KVM behavior in Linux Kernel 4.10 through 5.19 allows attackers to cause unspecified impact via unspecified vectors. In arch/x86/kvm/x86.c, fast IN handling is rerouted directly through __emulator_pio_in because that helper now fills val for in-kernel PIO. The Linux CNA describes the change as a pure no-op with no intended functional change and publishes no exploitation gate, observable failure, or security consequence.
The record
- CVE
- CVE-2022-4994
- Published
- Jul 30, 2026
- Updated
- Jul 30, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Jul 30, 2026CVE publishedPublication date reported by the CVE source.
- Jul 30, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.10
- Affected versionversion=8370c3d08bd98576d97514eca29970e03767a5d1 <dc7a4bfde507ffe1d8bef49aba1322f1d20c2cb3
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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