CVE-2026-64129 mm/migrate_device: fix spinlock leak in migrate_vma_insert_huge_pmd_page

What is CVE-2026-64129?

CVE-2026-64129 is a medium-severity vulnerability in Linux kernel, published on 19 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

mm/migrate_device: fix spinlock leak in migrate_vma_insert_huge_pmd_page

When check_stable_address_space() fails after the PMD spinlock has been acquired via pmd_lock(), the code jumps directly to the abort label, bypassing the spin_unlock() call in unlock_abort. This causes the PMD spinlock to be permanently held, leading to a deadlock.

Change the goto target from abort to unlock_abort to ensure the spinlock is always released on this error path.

Weakness: CWE-401

Which versions are affected by CVE-2026-64129?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-64129?

Apply the vendor's patch.

Is CVE-2026-64129 being exploited?

There is no known exploitation of CVE-2026-64129 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-64129, GHSA-536v-q9w2-w76r, UBUNTU-CVE-2026-64129.