SB2026091732 - 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-2026-89931)

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

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause vmcs12 pages to be double-mapped.

The vulnerability exists due to improper state management in KVM nVMX nested VM-Exit handling when emulating a nested VM-Exit. A local user can trigger a nested VM-Exit without the pending request being cleared to cause vmcs12 pages to be double-mapped.

The condition can occur if KVM exits VM-Enter without processing the request before emulating VMLAUNCH or VMRESUME.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/11722439fb206c88e6f31be54173efa9880b4ccb
• https://git.kernel.org/stable/c/674a3244f07f323f21a106a7bdcaebb6db6a5058
• https://git.kernel.org/stable/c/ae190f2439ca30067927077bf570d4c5edf07a0f
• https://git.kernel.org/stable/c/bbec4adc2f340d85f4a77a9ddcddaa6b1f4639c5