Improper Initialization in Linux kernel - CVE-2026-64309
Published: July 27, 2026
Vulnerability identifier: #VU139663
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-64309
CWE-ID: CWE-665
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper state management in the sev ioctl SNP_COMMIT handler when processing ioctl requests. A local user can invoke the SNP_COMMIT ioctl to cause a denial of service.
Exploitation requires access to /dev/sev, and the issue can crash the host by triggering a general protection fault during subsequent VMRUN execution for an active VM.
Affected software
Linux kernel
How to mitigate CVE-2026-64309
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3