CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page
A memory alignment bug in the Linux kernel ntfs3 driver can cause a kernel crash when handling inline data, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80868?
CVE-2026-80868 is a memory corruption vulnerability in Linux, published on 4 Sep 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:
ntfs3: Allocate iomap inline_data using alloc_page
This fixes a BUG reported in iomap_write_end_inline: iomap_inline_data_valid checks that the inline_data fits within a page. If the inline_data is allocated with kmemdup there's no guarantee that it's page-aligned, so the check sometimes fails. Allocate it with alloc_page to ensure it's page-aligned.
Which versions are affected by CVE-2026-80868?
How do I fix CVE-2026-80868?
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-2026-80868 being exploited?
There is no known exploitation of CVE-2026-80868 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-80868, GHSA-x9x6-757g-3j4w, UBUNTU-CVE-2026-80868.