SB2026081313 - Missing Release of Resource after Effective Lifetime in Linux kernel kvm vmx

Description

This security bulletin contains information about 1 vulnerability.

1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-68081)

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

CVSSv4: 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]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper resource shutdown or release in the KVM nVMX nested VM-Enter handling in arch/x86/kvm/vmx/nested.c when emulating VMLAUNCH or VMRESUME with invalid guest state. A local user can repeatedly trigger failed nested VM-Enter operations to cause a denial of service.

The issue occurs when KVM synthesizes a nested VM-Exit on invalid guest state, allowing pinned vmcs12 pages or mappings to be leaked if the operation is retried.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2c87a087c20632d68920272173b5d7c47f9bcf70
• https://git.kernel.org/stable/c/2f2312c422fd2695da772cecb30c69994b795964
• https://git.kernel.org/stable/c/7996013b85687034d2e820cef94d6404192e3a3d