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| Vulnerability ID | VCID-3r34-452w-skc2 |
| Aliases |
CVE-2026-31591
|
| Summary | 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). |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 6.3 |
| Risk | 3.1 |
| Affected and Fixed Packages | Package Details |
| CWE-820 | Missing Synchronization |
| System | Score | Found at |
|---|---|---|
| cvssv3 | 5.5 | https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-31591.json |
| cvssv3 | 7.0 | https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-31591.json |
| epss | 0.00012 | https://api.first.org/data/v1/epss?cve=CVE-2026-31591 |
| epss | 0.00017 | https://api.first.org/data/v1/epss?cve=CVE-2026-31591 |
| cvssv3.1 | 6.5 | https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Percentile | 0.0161 |
| EPSS Score | 0.00012 |
| Published At | April 29, 2026, 12:55 p.m. |
| Date | Actor | Action | Source | VulnerableCode Version |
|---|---|---|---|---|
| 2026-04-25T23:21:31.558617+00:00 | Debian Importer | Import | https://security-tracker.debian.org/tracker/data/json | 38.4.0 |