CVE-2026-89610: ntfs: verify run length exceeding volume boundary
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 nrclusters.
Affected Software
Event History
Frequently Asked Questions
Who is realistically exposed to this issue?
Systems that process a malformed NTFS filesystem image are exposed. The crafted image must contain mapping pairs that describe a cluster run starting within the volume but extending beyond its cluster boundary.
What does an attacker need to exploit it?
An attacker needs to provide or cause the system to process a malicious NTFS image with a crafted mapping pairs array. Successful exploitation could cause memory access beyond the volume boundary, with potential memory corruption and privilege escalation.
What validation does the fix add?
The fix verifies that the starting logical cluster number plus the run length remains within the volume's nr_clusters limit. Previously, only the starting logical cluster number was checked.