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Vulnerability record · CVE-2026-31558 · published 24 April 2026

CVE-2026-31558: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

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[].

8.8 CVSS 3.1 High EPSS 0.18% · top 93.7% CWE-125 · Out-of-bounds read
8.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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[].

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/2db06c15d8c7a0ccb6108524e16cd9163753f354 Patch
https://git.kernel.org/stable/c/47857b05bd50db01e211a1b6f513d57901cd3e6b Patch
https://git.kernel.org/stable/c/596c3f8069c4792f22fce8c4452f44410032d910 Patch
https://git.kernel.org/stable/c/878cf6acb4fd8ab4126cf9d369a5bb0e23123418 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31558), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.