Linux KVM: Direct __emulator_pio_in() Improves Fast PIO
CVE-2022-4994 Published on July 30, 2026
KVM: x86: wean fast IN from emulator_pio_in
In the Linux kernel, the following vulnerability has been resolved:
KVM: x86: wean fast IN from emulator_pio_in
Use __emulator_pio_in() directly for fast PIO instead of bouncing through
emulator_pio_in() now that __emulator_pio_in() fills "val" when handling
in-kernel PIO. vcpu->arch.pio.count is guaranteed to be '0', so this a
pure nop.
emulator_pio_in_emulated is now the last caller of emulator_pio_in.
No functional change intended.
Products Associated with CVE-2022-4994
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Affected Versions
Linux:- Version 8370c3d08bd98576d97514eca29970e03767a5d1 and below dc7a4bfde507ffe1d8bef49aba1322f1d20c2cb3 is affected.
- Version 4.10 is affected.
- Before 4.10 is unaffected.
- Version 6.0, <= * is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.