Bug 2509225 (CVE-2022-4994) - CVE-2022-4994 kernel: KVM: x86: wean fast IN from emulator_pio_in
Summary: CVE-2022-4994 kernel: KVM: x86: wean fast IN from emulator_pio_in
Keywords:
Status: NEW
Alias: CVE-2022-4994
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-30 10:01 UTC by OSIDB Bzimport
Modified: 2026-08-02 13:03 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-07-30 10:01:25 UTC 
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.
Comment 1 Mauro Matteo Cascella 2026-08-02 13:00:53 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026073058-CVE-2022-4994-07fd@gregkh/T
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