SB2026091730 - Race condition in Linux kernel kvm vmx

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-89929)

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

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to compromise confidentiality, integrity, and availability.

The vulnerability exists due to improper synchronization of TLB invalidation in KVM nested virtualization INVVPID emulation when a virtual machine is migrated between physical CPUs. A local user can cause L1 to migrate between physical CPUs while emulating INVVPID to compromise confidentiality, integrity, and availability.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/27bdeb5fd19046ffba9ff234e92fe553eb2efb30
• https://git.kernel.org/stable/c/6d00e67326d831e6e610933a3800712f4ffe6ec1
• https://git.kernel.org/stable/c/9941850e8adf164d005dbd3774c4b79e91a3cb8e
• https://git.kernel.org/stable/c/d03e721801ac54b9fdf05668aa0c069f07913b68