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CVE-2022-4994· NVD / CVE Program· CNA Linux

KVM: x86: wean fast IN from emulator_pio_in

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.19% (FIRST EPSS).
  • Fixed version: Linux Linux dc7a4bfde507ffe1d8bef49aba1322f1d20c2cb3.

Low priority for now. Upgrade to Linux Linux dc7a4bfde507ffe1d8bef49aba1322f1d20c2cb3 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Jul 30, 2026
Updated
Jul 30, 2026
EPSS
0.1% · 8th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.10affected
    • 8370c3d08bd98576d97514eca29970e03767a5d1 and later · before dc7a4bfde507ffe1d8bef49aba1322f1d20c2cb3affected · git
    • before 4.10not affected · semver
    • 6.0 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.0.2-16.0.2-1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-64kbbefore 5.14.21-150400.24.235.15.14.21-150400.24.235.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-docsbefore 5.14.21-150400.24.235.15.14.21-150400.24.235.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-obs-buildbefore 5.14.21-150400.24.235.15.14.21-150400.24.235.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-symsbefore 5.14.21-150400.24.235.15.14.21-150400.24.235.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-64kbbefore 5.14.21-150500.55.182.15.14.21-150500.55.182.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-docsbefore 5.14.21-150500.55.182.15.14.21-150500.55.182.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-obs-buildbefore 5.14.21-150500.55.182.15.14.21-150500.55.182.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-symsbefore 5.14.21-150500.55.182.15.14.21-150500.55.182.1
SUSE:Linux Enterprise Live Patching 15 SP4kernel-livepatch-SLE15-SP4_Update_58before 1-150400.9.7.11-150400.9.7.1
SUSE:Linux Enterprise Live Patching 15 SP5kernel-livepatch-SLE15-SP5_Update_44before 1-150500.11.5.11-150500.11.5.1
SUSE:Linux Enterprise Micro 5.3kernel-defaultbefore 5.14.21-150400.24.235.15.14.21-150400.24.235.1
SUSE:Linux Enterprise Micro 5.3kernel-default-basebefore 5.14.21-150400.24.235.1.150400.24.118.35.14.21-150400.24.235.1.150400.24.118.3
SUSE:Linux Enterprise Micro 5.3kernel-rtbefore 5.14.21-150400.15.181.15.14.21-150400.15.181.1
SUSE:Linux Enterprise Micro 5.3kernel-sourcebefore 5.14.21-150400.24.235.15.14.21-150400.24.235.1
SUSE:Linux Enterprise Micro 5.3kernel-source-rtbefore 5.14.21-150400.15.181.15.14.21-150400.15.181.1
SUSE:Linux Enterprise Micro 5.5kernel-defaultbefore 5.14.21-150500.55.182.15.14.21-150500.55.182.1
SUSE:Linux Enterprise Micro 5.5kernel-default-basebefore 5.14.21-150500.55.182.1.150500.6.85.25.14.21-150500.55.182.1.150500.6.85.2
SUSE:Linux Enterprise Micro 5.5kernel-rtbefore 5.14.21-150500.13.156.15.14.21-150500.13.156.1
SUSE:Linux Enterprise Micro 5.5kernel-sourcebefore 5.14.21-150500.55.182.15.14.21-150500.55.182.1
SUSE:Linux Enterprise Micro 5.5kernel-source-rtbefore 5.14.21-150500.13.156.15.14.21-150500.13.156.1
SUSE:Linux Enterprise Server 15 SP4-LTSSkernel-zfcpdumpbefore 5.14.21-150400.24.235.15.14.21-150400.24.235.1
SUSE:Linux Enterprise Server 15 SP5-LTSSkernel-zfcpdumpbefore 5.14.21-150500.55.182.15.14.21-150500.55.182.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-64559Jul 29, 2026 · s390/pkey: Check length in PKEY_VERIFYPROTK ioctl
    31Monitor
  • ← EarlierCVE-2026-64560Jul 29, 2026 · posix-cpu-timers: Prevent UAF caused by non-leader exec() race
    31Monitor
  • Later →CVE-2026-64565Aug 4, 2026 · Input: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data()
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linuxdc7a4bfde507ffe1d8bef49aba1322f1d20c2cb3Vendor (CNA)
debian:linux6.0.2-1 · Debian:12Package registry (OSV)
suse:kernel-64kb5.14.21-150400.24.235.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:kernel-default5.14.21-150400.24.235.1 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)
suse:kernel-default-base5.14.21-150400.24.235.1.150400.24.118.3 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)
suse:kernel-docs5.14.21-150400.24.235.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:kernel-livepatch-SLE15-SP4_Update_581-150400.9.7.1 · SUSE:Linux Enterprise Live Patching 15 SP4Package registry (OSV)
suse:kernel-livepatch-SLE15-SP5_Update_441-150500.11.5.1 · SUSE:Linux Enterprise Live Patching 15 SP5Package registry (OSV)
suse:kernel-obs-build5.14.21-150400.24.235.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:kernel-rt5.14.21-150400.15.181.1 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)
suse:kernel-source5.14.21-150400.24.235.1 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)
suse:kernel-source-rt5.14.21-150400.15.181.1 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)
suse:kernel-syms5.14.21-150400.24.235.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:kernel-zfcpdump5.14.21-150400.24.235.1 · SUSE:Linux Enterprise Server 15 SP4-LTSSPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records