5.5

CVE-2026-31591: linux

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-31591DEBIAN-CVE-2026-31591CGA-25cm-x5jj-v7rc
Published 24-04-2026Last modified 14-06-2026
Open JSON

Vulnerability summary

CVE-2026-31591 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.16%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 14 · Related 15
OPENSUSE-SU-2026:10703-1OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23221-1SUSE-SU-2026:23231-1

Timeline

  1. 24-04-2026
    PublishedVulnerability first disclosed.
  2. 14-06-2026
    Last modifiedVulnerability information updated.

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).

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

+0.04 pp

From 0.12% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.16%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu110 products
  • linuxAll versions (No fix recorded) | < 7.0.0-27.27
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 7.0.0-1008.8
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Chainguard11 products
  • linux-aws-6.12All versions (No fix recorded)
  • linux-aws-6.18< 6.18.31-r0
  • linux-azure-6.12All versions (No fix recorded)
  • linux-azure-6.18< 6.18.31-r0
  • linux-gcp-6.12All versions (No fix recorded)
Linux2 products
  • linux≥ ad27ce155566f2b4400fa865859834592bd18777, < 30fd9d8c82087742168db779929d8be0459b0716 | ≥ ad27ce155566f2b4400fa865859834592bd18777, < 4df77742e8b9a6b935bdf46f02fd0aca4d4ee7f5 | ≥ ad27ce155566f2b4400fa865859834592bd18777, < c87938fc7d99a06a7e5477c45b4e5a4148f85d66 | ≥ ad27ce155566f2b4400fa865859834592bd18777, < cb923ee6a80f4e604e6242a4702b59251e61a380 | 6.11
  • linux_kernel≥ 6.11, < 6.18.24 | ≥ 6.19, < 6.19.14 | ≥ 7.0, < 7.0.1
Debian1 product
  • linuxAll versions (No fix recorded) | < 6.19.14-1

4 vendors · 124 products

References

14 links
Show all 14 references