LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust_CVE-2026-31558

8.8 / 10

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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[].

AI Analysis

Out-of-bounds access vulnerability in the Linux kernel's KVM module

Basic Information

ID CVE-2026-31558

Source Linux

Published Apr 24, 2026 at 14:35

Modified Apr 27, 2026 at 14:04

Affected Product

Vendor Linux

Product Linux

Version 73516e9da512adc63ba3859fbd82a21f6257348f

Affected Versions Linux Linux 73516e9da512adc63ba3859fbd82a21f6257348f
Linux Linux 73516e9da512adc63ba3859fbd82a21f6257348f
Linux Linux 73516e9da512adc63ba3859fbd82a21f6257348f
Linux Linux 73516e9da512adc63ba3859fbd82a21f6257348f
Linux Linux 6.10

AI Assessment

AI Score 8.8 / 10

AI Severity High

Vendor Linux

Product Linux Kernel

Version 6.10, 73516e9da512adc63ba3859fbd82a21f6257348f

References

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    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust\n\nkvm_get_vcpu_by_cpuid() takes a cpuid parameter whose type is int, so\ncpuid can be negative. Let kvm_get_vcpu_by_cpuid() return NULL for this\ncase so as to make it more robust.\n\nThis fix an out-of-bounds access to kvm_arch::phyid_map::phys_map[].",
    "published": "2026-04-24T14:35:41.209Z",
    "modified": "2026-04-27T14:04:04.707Z",
    "type": "cve",
    "title": "LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust",
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    "references": "https://git.kernel.org/stable/c/596c3f8069c4792f22fce8c4452f44410032d910\nhttps://git.kernel.org/stable/c/878cf6acb4fd8ab4126cf9d369a5bb0e23123418\nhttps://git.kernel.org/stable/c/47857b05bd50db01e211a1b6f513d57901cd3e6b\nhttps://git.kernel.org/stable/c/2db06c15d8c7a0ccb6108524e16cd9163753f354",
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