# CVE-2022-4994: linux: In the Linux kernel, the following vulnerability has been resolved:  KVM: x86: wean fast IN from emulator_pio_in  Use...

CVE-2022-4994 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-4994, released July 31, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-4994
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 30, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.2-1 | [DEBIAN-CVE-2022-4994](https://patchblox.com/security/data/fix/linux/debian-cve-2022-4994.md) | Jul 31, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.0.2-1 | [DEBIAN-CVE-2022-4994](https://patchblox.com/security/data/fix/linux/debian-cve-2022-4994.md) | Jul 31, 2026 |
| Linux | linux Debian 14 | 6.0.2-1 | [DEBIAN-CVE-2022-4994](https://patchblox.com/security/data/fix/linux/debian-cve-2022-4994.md) | Jul 31, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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