What’s Vulnerable › Vulnerabilities

CVE-2026-31591: KVM: SEV: Lock all vCPUs when synchronzing VMSAs for SNP launch finish

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-24 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Lock all vCPUs when synchronzing VMSAs for SNP launch finish Lock all vCPUs when synchronizing and encrypting VMSAs for SNP guests, as allowing userspace to manipulate and/or run a vCPU while its state is being synchronized would at best corrupt vCPU state, and at worst crash the host kernel. Opportunistically assert that vcpu->mutex is held when synchronizing its VMSA (the SEV-ES path already locks vCPUs).

Affected products

• Linux kernel: from 6.11 before 6.18.24; from 6.19 before 6.19.14; from 7.0 before 7.0.1 — fixed in 6.18.24, 6.19.14, 7.0.1

How to fix

Upgrade to a fixed version: Linux kernel 6.18.24, 6.19.14, 7.0.1. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/30fd9d8c82087742168db779929d8be0459b0716
• https://git.kernel.org/stable/c/4df77742e8b9a6b935bdf46f02fd0aca4d4ee7f5
• https://git.kernel.org/stable/c/c87938fc7d99a06a7e5477c45b4e5a4148f85d66
• https://git.kernel.org/stable/c/cb923ee6a80f4e604e6242a4702b59251e61a380

Get alerted when CVE-2026-31591 or the next vulnerability affects your stack