SB20260529148 - Race condition in Linux kernel hyp nvhe

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-46147)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/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 synchronization in register_hyp_vcpu() and pkvm_load_hyp_vcpu() when publishing and loading vCPU pointers during vCPU initialization. A local user can trigger concurrent access to cause a denial of service.

A concurrent reader may observe a partially initialized hyp_vcpu object.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/6d69c0ed978f7f0efd053fc98390f25ab77c1aea
• https://git.kernel.org/stable/c/73b9c1e5da84cd69b1a86e374e450817cd051371
• https://git.kernel.org/stable/c/7d3c27b54253cda91dc4d2c1bfc109c490837ab9