SB20260727270 - Missing Release of Resource after Effective Lifetime in Linux kernel x86 mm

Description

This security bulletin contains information about 1 vulnerability.

1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-64302)

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

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 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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/03f6ecbc446c33b38fd452cd3c494092a8116967
• https://git.kernel.org/stable/c/39406c05f8f150f1685839acd38ffdd69ff92031
• https://git.kernel.org/stable/c/add1e4112e00b619614784bf630aeebfdefa23e1