Dashboard / CVE-2026-31591

CVE-2026-31591

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 36/100
Published: 2026-04-24 Modified: 2026-11-11 First seen: 2026-11-06 Status: active

Attack Surface

Low Complexity No Interaction

CVSS Vector Breakdown

AV: Local
AC: Low
PR: Low
UI: None
S: Unchanged
C: None
I: None
A: High

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 Software (6)

VendorProductVersion
Linux Linux ad27ce155566f2b4400fa865859834592bd18777 < 30fd9d8c82087742168db779929d8be0459b0716
Linux Linux ad27ce155566f2b4400fa865859834592bd18777 < 4df77742e8b9a6b935bdf46f02fd0aca4d4ee7f5
Linux Linux ad27ce155566f2b4400fa865859834592bd18777 < c87938fc7d99a06a7e5477c45b4e5a4148f85d66
Linux Linux ad27ce155566f2b4400fa865859834592bd18777 < cb923ee6a80f4e604e6242a4702b59251e61a380
Linux Linux 6.11
linux linux_kernel 6.11 – 6.18.24

References & Advisories (4)

Bug Bounty Relevance

36 / 100
✓ Low complexity
✓ No user interaction

CVSS Score

5.5 / 10.0 v3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploitation Probability

0.12%
Raw Score 0.001220
Percentile 2.0%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00122
2026-11-12
0.00122
2026-11-10
0.00122
2026-11-09
0.00122
2026-11-08
0.00122
2026-11-07
0.00122
2026-11-06
0.00122

Intelligence Sources

mitre ref →
nvd ref →

External Links