# CVE-2026-31558

> Vulnerability · severity: **HIGH** (CVSS 8.8).

## Description

In the Linux kernel, the following vulnerability has been resolved:

LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust

kvm_get_vcpu_by_cpuid() takes a cpuid parameter whose type is int, so
cpuid can be negative. Let kvm_get_vcpu_by_cpuid() return NULL for this
case so as to make it more robust.

This fix an out-of-bounds access to kvm_arch::phyid_map::phys_map[].

## Key facts

- **CVE ID:** CVE-2026-31558
- **Published:** 2026-04-24
- **CVSS severity:** HIGH
- **CVSS base score:** 8.8
- **CWE codes:** CWE-125

## Affected products

- `linux:linux_kernel`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31558

## Citation

> AI Analytics. CVE-2026-31558. Retrieved 2026-08-08 from https://api.ai-analytics.org/cve/CVE-2026-31558. Derived from NIST NVD. Licensed CC0.

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