CVE-2022-49991 mm/hugetlb: avoid corrupting page->mapping in hugetlb_mcopy_atomic_pte
A memory corruption flaw in the Linux kernel's hugetlb subsystem allows attackers to corrupt page mappings, potentially leading to code execution or privilege escalation.
- 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-2022-49991?
CVE-2022-49991 is a high-severity memory corruption vulnerability in Linux kernel, published on 18 Jun 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/hugetlb: avoid corrupting page->mapping in hugetlb_mcopy_atomic_pte
In MCOPY_ATOMIC_CONTINUE case with a non-shared VMA, pages in the page cache are installed in the ptes. But hugepage_add_new_anon_rmap is called for them mistakenly because they're not vm_shared. This will corrupt the page->mapping used by page cache code.
Which versions are affected by CVE-2022-49991?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-49991?
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-2022-49991 being exploited?
There is no known exploitation of CVE-2022-49991 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-49991, GHSA-v9rq-j9p7-c4v2, UBUNTU-CVE-2022-49991.