SB2026081689 - Improper control of a resource through its lifetime in Linux kernel kvm vmx

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-72287)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to execute code in the host kernel.

The vulnerability exists due to improper state management in KVM nVMX nested VM-entry control checks when entering non-root mode with a crafted vTPR and TPR threshold combination. A local privileged user can supply crafted nested VMX state to cause KVM to run L1 with an L1-controlled CR3 to execute code in the host kernel.

The issue arises when EPT is disabled, and the consistency check was performed only in a late validation path.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/7d066368f72e6192af7e21c5817626f6da666991
• https://git.kernel.org/stable/c/ebdac7554abb347ca4197be241116842161acd9b