SB20260727261 - Improper Initialization in Linux kernel crypto ccp driver
Published: July 27, 2026
Security Bulletin ID
SB20260727261
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) Improper Initialization (CVE-ID: CVE-2026-64309)
CWE-ID: CWE-665 - Improper Initialization
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 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.
Remediation
Install update from vendor's website.