CVE-2025-39754 mm/smaps: fix race between smaps_hugetlb_range and migration
A race condition in the Linux kernel's smaps_hugetlb_range function can cause a kernel crash, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-39754?
CVE-2025-39754 is a medium-severity vulnerability in Linux kernel, published on 11 Sep 2025. 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/smaps: fix race between smaps_hugetlb_range and migration
smaps_hugetlb_range() handles the pte without holdling ptl, and may be concurrenct with migration, leaing to BUG_ON in pfn_swap_entry_to_page(). The race is as follows.
smaps_hugetlb_range migrate_pages huge_ptep_get remove_migration_ptes folio_unlock pfn_swap_entry_folio BUG_ON
To fix it, hold ptl lock in smaps_hugetlb_range().
Weakness: CWE-362
Which versions are affected by CVE-2025-39754?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-39754?
Apply the vendor's patch.
Is CVE-2025-39754 being exploited?
There is no known exploitation of CVE-2025-39754 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-67175, AZL-70952, BELL-CVE-2025-39754, DEBIAN-CVE-2025-39754, GHSA-fppf-vq4v-6j7g, OESA-2025-2411 and 5 more.