#VU124939 Use-after-free in Linux kernel - CVE-2026-23432
Published: April 6, 2026
Vulnerability identifier: #VU124939
Vulnerability risk: Low
CVSSv4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-23432
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
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 security update from vendor's repository.