SB2026050980 - Improper Check or Handling of Exceptional Conditions in Linux kernel kvm svm

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Main Vulnerability Database SB2026050980

SB2026050980 - Improper Check or Handling of Exceptional Conditions in Linux kernel kvm svm

Published: May 9, 2026

Security Bulletin ID SB2026050980
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Partial DoS

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Check or Handling of Exceptional Conditions (CVE-ID: CVE-2026-43315)

CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper handling of a user-triggerable warning in nested_svm_load_cr3() and svm_set_nested_state() in KVM nSVM when restoring nested vCPU state after modifying CPUID and CR3 values from userspace. A local user can supply an illegal combination of nested state, CPUID, and CR3 values to trigger a kernel warning and cause a denial of service.

The issue is reachable through the KVM userspace ABI during nested virtualization state restoration.


Remediation

Install update from vendor's website.

References