SB2026080749 - Always-Incorrect Control Flow Implementation in Linux kernel kvm vmx
Published: August 7, 2026
Security Bulletin ID
SB2026080749
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-64604)
CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation
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 state handling in vmx_update_cr8_intercept when creating a vCPU outside guest mode. A local user can issue crafted KVM vCPU creation operations to cause a denial of service.
The issue can trigger a kernel warning due to calling get_vmcs12() when the vCPU is not in guest mode.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/258ec63c0f281bf7b50f9de67c8e93b5b7be5ed4
- https://git.kernel.org/stable/c/3dcfb04dd43b16fa1240fc6487fff578ad57264c
- https://git.kernel.org/stable/c/570af5db081b87374594a00711ac5760d2ea6844
- https://git.kernel.org/stable/c/7ef78d71ca713d8c00f7c34ddcf276c808143f77
- https://git.kernel.org/stable/c/9a21f1defd96c6301c5fb462a78eb51b191bd2dd
- https://git.kernel.org/stable/c/c7cd3605244c924249dea32632e1bc3e89bda543
- https://git.kernel.org/stable/c/db8407b9fd06d857a4a5e8bcff1d086d13007711
- https://git.kernel.org/stable/c/ffaaff82336db84e9b58e7a3e81c2fd64e05ed7a