CVE-2026-31564

Host service interruption via scaled pointer arithmetic

Published Apr 24, 2026 · Updated Apr 24, 2026

Incorrect pointer arithmetic in LoongArch KVM in Linux Kernel 6.19 allows local users to interrupt host service via EIOINTC register access. kvm_eiointc_regs_access() adds byte offsets to u64 array bases, scaling the offsets by eight and selecting incorrect register addresses instead of first converting each base to void *. Reachability requires local low-privilege access on a LoongArch host running KVM with its EIOINTC device; the documented consequence is availability loss only.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect pointer arithmetic in LoongArch KVM in Linux Kernel 6.19 allows local users to interrupt host service via EIOINTC register access. kvm_eiointc_regs_access() adds byte offsets to u64 array bases, scaling the offsets by eight and selecting incorrect register addresses instead of first converting each base to void *. Reachability requires local low-privilege access on a LoongArch host running KVM with its EIOINTC device; the documented consequence is availability loss only.

The record

CVE
CVE-2026-31564
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.19
  2. Affected versionversion=d3e43a1f34acbb9a814337fc5624765538e5a274 <6bcfb7f46d667b04bd1a1169ccedf5fb699c60df
  3. Affected versionversion=d3e43a1f34acbb9a814337fc5624765538e5a274 <c4f0a9481cf0dd7c71a07484bc98f2570fdb3a82

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=d3e43a1f34acbb9a814337fc5624765538e5a274 <6bcfb7f46d667b04bd1a1169ccedf5fb699c60df; version=d3e43a1f34acbb9a814337fc5624765538e5a274 <c4f0a9481cf0dd7c71a07484bc98f2570fdb3a82

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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