Race condition in Linux kernel - CVE-2026-46147

Vulnerability identifier: #VU133044

CSH Severity: Low

CVSS v4: 6.8 [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]

CVE-ID: CVE-2026-46147

CWE-ID: CWE-362

Exploitation vector: Local access

Exploit availability: No public exploit available

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.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure (Ubuntu package)
linux-aws (Ubuntu package)

Install security update from vendor's repository.

linux (Ubuntu package) - addressed in versions 7.0.0-28.28, 7.0.0-28.28.1, 7.0.0-1003.4, 7.0.0-1008.8
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1009.9
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15

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

• Race condition in Linux kernel hyp nvhe
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux
• Ubuntu update for linux-ibm
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws