CVE-2026-89610 ntfs: verify run length exceeding volume boundary
A missing boundary check in the Linux kernel NTFS driver allows memory corruption and privilege escalation via a malformed image.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-89610?
CVE-2026-89610 is a critical memory corruption vulnerability in Linux, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ntfs: verify run length exceeding volume boundary
The mapping pairs decoder validates that the starting LCN is within the volume but does not check if the run extends beyond the volume boundary.
A malformed NTFS image with a crafted mapping pairs array could cause the kernel to access memory beyond the volume boundary, potentially leading to memory corruption and privilege escalation.
Add validation to ensure lcn + length stays within nr_clusters.
Which versions are affected by CVE-2026-89610?
How do I fix CVE-2026-89610?
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-2026-89610 being exploited?
There is no known exploitation of CVE-2026-89610 in the wild and no public exploit code.
Sources
Also known as AZL-100785, BELL-CVE-2026-89610, DEBIAN-CVE-2026-89610, GHSA-whjw-7h99-rmg2, UBUNTU-CVE-2026-89610.