Advisory [CVE-2026-63953] fix pgtable leak in migrate_vma_insert_huge_pmd_page
This security Red Hat Linux advisory covers CVE-2026-63953.
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Summary
In the Linux kernel, the following vulnerability has been resolved: mm/migrate_device: fix pgtable leak in migrate_vma_insert_huge_pmd_page When migrate_vma_insert_huge_pmd_page() jumps to unlock_abort due to a PMD check failure, the pgtable allocated earlier via pte_alloc_one() is never freed, causing a memory leak.
Added free_abort label to release the pgtable in error path. A flaw was found in the Linux kernel's memory management component, specifically within the `mm/migrate_device` module.
When handling device page migration, a page table (pgtable) allocated during the `migrate_vma_insert_huge_pmd_page` function may not be properly freed if a specific error condition occurs. This oversight can lead to a memory leak, potentially impacting system stability and performance over time.
Red Hat severity: not rated. Weakness: CWE-772.
Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
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