Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: x86/mm: Fix freeing of PMD-sized vmemmap pages Commit bf9e4e30f353 ("x86/mm: use… (CVE-2026-64302)
A vulnerability in the Linux kernel related to improper freeing of PMD-sized vmemmap pages was resolved. The flaw involved incorrect handling of vmemmap pages during memory freeing operations, leading to potential memory leaks. This issue was fixed by decoupling the freeing mechanisms for pagetables and vmemmap pages. The vulnerability affects Linux kernel versions prior to certain 7.0.0 releases for the linux-hwe-edge package. A patch is available and should be applied to mitigate the issue.
AI Analysis
Technical Summary
The Linux kernel had a vulnerability in the x86/mm subsystem where the function used to free PMD-sized vmemmap pages incorrectly applied pagetable_free(), which is intended for page tables, not vmemmap pages. This caused only the first page of a PMD-sized vmemmap page to be freed, leaking the remaining pages. The fix involved properly separating the freeing logic for pagetables and vmemmap pages, ensuring correct memory management. This vulnerability is tracked as CVE-2026-64302 and affects linux-hwe-edge kernel versions before 7.0.0-1012.12~24.04.1 and related versions. The issue has been patched in updated kernel releases as per the Ubuntu security advisories USN-8726-1 and USN-8727-1.
Potential Impact
The vulnerability can cause memory leaks due to improper freeing of vmemmap pages in the Linux kernel. While the CVSS score is medium (5.5), the impact is primarily on system stability and resource management rather than direct confidentiality or integrity compromise. There is no indication of active exploitation in the wild. The issue could potentially affect system reliability if unpatched.
Mitigation Recommendations
A patch is available and has been released by Ubuntu in updated linux-hwe-edge kernel packages. Users should update their systems to the fixed kernel versions (7.0.0-1012.12~24.04.1 or later) as provided in the Ubuntu security notices USN-8726-1 and USN-8727-1. After updating, a system reboot is required to apply the fixes. Additionally, due to an ABI change, third-party kernel modules must be recompiled and reinstalled. No other specific mitigations are required.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: x86/mm: Fix freeing of PMD-sized vmemmap pages Commit bf9e4e30f353 ("x86/mm: use… (CVE-2026-64302)
Description
A vulnerability in the Linux kernel related to improper freeing of PMD-sized vmemmap pages was resolved. The flaw involved incorrect handling of vmemmap pages during memory freeing operations, leading to potential memory leaks. This issue was fixed by decoupling the freeing mechanisms for pagetables and vmemmap pages. The vulnerability affects Linux kernel versions prior to certain 7.0.0 releases for the linux-hwe-edge package. A patch is available and should be applied to mitigate the issue.
CVSS v3.1
Score 5.5medium
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel had a vulnerability in the x86/mm subsystem where the function used to free PMD-sized vmemmap pages incorrectly applied pagetable_free(), which is intended for page tables, not vmemmap pages. This caused only the first page of a PMD-sized vmemmap page to be freed, leaking the remaining pages. The fix involved properly separating the freeing logic for pagetables and vmemmap pages, ensuring correct memory management. This vulnerability is tracked as CVE-2026-64302 and affects linux-hwe-edge kernel versions before 7.0.0-1012.12~24.04.1 and related versions. The issue has been patched in updated kernel releases as per the Ubuntu security advisories USN-8726-1 and USN-8727-1.
Potential Impact
The vulnerability can cause memory leaks due to improper freeing of vmemmap pages in the Linux kernel. While the CVSS score is medium (5.5), the impact is primarily on system stability and resource management rather than direct confidentiality or integrity compromise. There is no indication of active exploitation in the wild. The issue could potentially affect system reliability if unpatched.
Mitigation Recommendations
A patch is available and has been released by Ubuntu in updated linux-hwe-edge kernel packages. Users should update their systems to the fixed kernel versions (7.0.0-1012.12~24.04.1 or later) as provided in the Ubuntu security notices USN-8726-1 and USN-8727-1. After updating, a system reboot is required to apply the fixes. Additionally, due to an ABI change, third-party kernel modules must be recompiled and reinstalled. No other specific mitigations are required.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-rmr6-r8pg-m34q
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-64302"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a65420d9c2644c7f8085cf1
Added to database: 07/25/2026, 23:09:01 UTC
Last enriched: 09/07/2026, 18:11:29 UTC
Last updated: 09/08/2026, 10:52:11 UTC
Views: 57
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