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Vulnerability · Published Jul 30, 2026 · Assigned by Linux

CVE-2022-4994KVM: x86: wean fast IN from emulator_pio_in

Unrated

In plain English

A security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS )–Not rated
Exploit odds (30 days)0.2%top 91.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.0.2-1DEBIAN-CVE-2022-4994
Debian:13linux6.0.2-1DEBIAN-CVE-2022-4994
Debian:14linux6.0.2-1DEBIAN-CVE-2022-4994
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2022-4994
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2022-4994
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2022-4994

Affected products (as reported)

VendorProductVersions
Linux Linux 8370c3d08bd98576d97514eca29970e03767a5d1 – before dc7a4bfde507ffe1d8bef49aba1322f1d20c2cb3
Linux Linux 4.10

References