PT-2026-34943 · Linux · Linux Kernel

CVE-2026-31591 · Published 2026-04-24 · Updated 2026-07-24

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

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

Description An issue exists in the KVM SEV component where vCPUs are not locked during the synchronization and encryption of VMSAs for SNP guests. If userspace manipulates or runs a vCPU while its state is being synchronized, it could lead to vCPU state corruption or a host kernel crash.

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

Exploit

Related Identifiers

CVE-2026-31591

OPENSUSE-SU-2026:10703-1

SUSE-SU-2026:2482-1

SUSE-SU-2026:2591-1

USN-8488-1

USN-8488-2

USN-8507-1

USN-8569-1

USN-8603-1

Affected Products

Linux Kernel

References · 1357

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31591.json · Exploit
• https://ubuntu.com/security/CVE-2026-64049 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-64070 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-46024 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-63910 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-63841 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-64075 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-53025 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-63860 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-45991 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-46137 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-64066 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-46223 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-31581 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-45999 · Vendor Advisory