# CVE-2026-31558: linux: In the Linux kernel, the following vulnerability has been resolved:  LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() mor...

CVE-2026-31558 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-31558, released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-31558
- Priority: High
- CVSS: 8.8 (high)
- EPSS: 0.0013
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 24, 2026

## 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[].

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.85-1 | [DEBIAN-CVE-2026-31558](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31558.md) | May 15, 2026 |
| Linux | linux Debian 14 | 6.19.11-1 | [DEBIAN-CVE-2026-31558](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31558.md) | May 15, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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