CVE-2026-63953 mm/migrate_device: fix pgtable leak in migrate_vma_insert_huge_pmd_page
A memory leak in the Linux kernel's device migration code allows attackers to exhaust system memory, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Not stated
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-63953?
CVE-2026-63953 is a memory corruption vulnerability in Linux, published on 19 Jul 2026.
Official description
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.
Which versions are affected by CVE-2026-63953?
How do I fix CVE-2026-63953?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-63953 being exploited?
There is no known exploitation of CVE-2026-63953 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-63953, GHSA-68mw-455j-vxm4, UBUNTU-CVE-2026-63953.