PT-2026-34910 · Linux · Linux Kernel

Published 2026-04-24 · Updated 2026-05-03 · CVE-2026-31558

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An out-of-bounds access occurs in the kvm arch::phyid map::phys map[] array within the LoongArch KVM implementation. This is caused by the kvm get vcpu by cpuid() function accepting a cpuid parameter of type int, which allows negative values to be processed.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-31558

Affected Products

Linux Kernel

References · 14

• https://git.kernel.org/stable/c/2db06c15d8c7a0ccb6108524e16cd9163753f354 · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-31558 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-31558 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31558 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31558 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-31558 · Vendor Advisory
• https://git.kernel.org/stable/c/878cf6acb4fd8ab4126cf9d369a5bb0e23123418 · Patch
• https://git.kernel.org/stable/c/596c3f8069c4792f22fce8c4452f44410032d910 · Patch
• https://cve.org/CVERecord?id=CVE-2026-31558 · Security Note
• https://git.kernel.org/stable/c/47857b05bd50db01e211a1b6f513d57901cd3e6b · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31558 · Vendor Advisory
• https://docs.bell-sw.com/security/cves/CVE-2026-31558 · Note
• https://twitter.com/CVEnew/status/2047798627578634409 · Twitter Post
• https://git.kernel.org/linus/2db06c15d8c7a0ccb6108524e16cd9163753f354 · Note