Missing Release of Resource after Effective Lifetime in Linux kernel - CVE-2026-64302
Published: July 27, 2026
Vulnerability identifier: #VU139672
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-2026-64302
CWE-ID: CWE-772
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 resource management in vmemmap page freeing in arch/x86/mm/init_64.c when freeing PMD-sized vmemmap pages. A local user can trigger freeing of affected vmemmap pages to cause a denial of service.
The issue can leak all but the first page of a PMD-sized vmemmap allocation because the pages are not compound pages.
Affected software
Linux kernel
How to mitigate CVE-2026-64302
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3