In the Linux kernel, the following vulnerability has been resolved: mm/migrate_device: fix pgtable leak in migrate_vma_insert_huge_pmd_page When… (CVE-2026-63953)
A memory leak vulnerability in the Linux kernel was resolved in the memory management code related to device migration. Specifically, when migrate_vma_insert_huge_pmd_page() encounters a PMD check failure and jumps to an error path, the previously allocated page table is not freed, causing a memory leak. The fix adds a label to properly release the allocated page table in the error path.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel's memory management subsystem involves a failure to free allocated page tables during an error condition in migrate_vma_insert_huge_pmd_page(). This results in a memory leak when the function jumps to unlock_abort due to a PMD check failure. The patch introduces a free_abort label to ensure the allocated page table is freed on error, preventing the leak.
Potential Impact
The issue causes a memory leak in the kernel's memory management when handling huge page migration. While this does not directly lead to code execution or privilege escalation, it can degrade system stability or performance over time due to resource exhaustion.
Mitigation Recommendations
A fix has been implemented to address this vulnerability by adding proper cleanup of allocated page tables in the error path. Users should apply the official Linux kernel updates that include this patch to remediate the issue. Patch status is not explicitly confirmed in the provided data; therefore, check the vendor advisory for current remediation guidance.
In the Linux kernel, the following vulnerability has been resolved: mm/migrate_device: fix pgtable leak in migrate_vma_insert_huge_pmd_page When… (CVE-2026-63953)
Description
A memory leak vulnerability in the Linux kernel was resolved in the memory management code related to device migration. Specifically, when migrate_vma_insert_huge_pmd_page() encounters a PMD check failure and jumps to an error path, the previously allocated page table is not freed, causing a memory leak. The fix adds a label to properly release the allocated page table in the error path.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in the Linux kernel's memory management subsystem involves a failure to free allocated page tables during an error condition in migrate_vma_insert_huge_pmd_page(). This results in a memory leak when the function jumps to unlock_abort due to a PMD check failure. The patch introduces a free_abort label to ensure the allocated page table is freed on error, preventing the leak.
Potential Impact
The issue causes a memory leak in the kernel's memory management when handling huge page migration. While this does not directly lead to code execution or privilege escalation, it can degrade system stability or performance over time due to resource exhaustion.
Mitigation Recommendations
A fix has been implemented to address this vulnerability by adding proper cleanup of allocated page tables in the error path. Users should apply the official Linux kernel updates that include this patch to remediate the issue. Patch status is not explicitly confirmed in the provided data; therefore, check the vendor advisory for current remediation guidance.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-68mw-455j-vxm4
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-63953"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a5d27aa2a4a8d598912ebf0
Added to database: 07/19/2026, 19:38:18 UTC
Last enriched: 07/19/2026, 20:06:06 UTC
Last updated: 07/20/2026, 17:51:25 UTC
Views: 12
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