SB20260406103 - Use-after-free in Linux kernel hv driver
Published: April 6, 2026
Security Bulletin ID
SB20260406103
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 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-23432)
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in mshv_map_user_memory() error path when handling userspace memory unmapping after a failed user memory mapping operation. A local user can trigger the error path and later unmap the memory to cause a denial of service.
The issue occurs because the MMU notifier remains registered after the region is freed, and a later notifier callback accesses freed memory, potentially causing a kernel panic.
Remediation
Install update from vendor's website.