# CVE-2025-71266

## Summary

- **CVE ID:** CVE-2025-71266
- **Severity:** MEDIUM
- **CVSS Score:** 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** N/A
- **Published:** Mar 18, 2026
- **Last Modified:** Sep 8, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

fs: ntfs3: check return value of indx_find to avoid infinite loop

We found an infinite loop bug in the ntfs3 file system that can lead to a
Denial-of-Service (DoS) condition.

A malformed dentry in the ntfs3 filesystem can cause the kernel to hang
during the lookup operations. By setting the HAS_SUB_NODE flag in an
INDEX_ENTRY within a directory's INDEX_ALLOCATION block and manipulating the
VCN pointer, an attacker can cause the indx_find() function to repeatedly
read the same block, allocating 4 KB of memory each time. The kernel lacks
VCN loop detection and depth limits, causing memory exhaustion and an OOM
crash.

This patch adds a return value check for fnd_push() to prevent a memory
exhaustion vulnerability caused by infinite loops. When the index exceeds the
size of the fnd->nodes array, fnd_push() returns -EINVAL. The indx_find()
function checks this return value and stops processing, preventing further
memory allocation.

## Affected Products

- Linux — Linux (82cae269cfa953032fbb8980a7d554d60fb00b17)
- Linux — Linux (5.15)
- Linux — Linux (0)
- Linux — Linux (5.15.202)
- Linux — Linux (6.1.165)
- Linux — Linux (6.6.128)
- Linux — Linux (6.12.75)
- Linux — Linux (6.18.16)
- Linux — Linux (6.19.6)
- Linux — Linux (7.0-rc1)
- Linux — Linux (7.0)

## References

- [CNA](https://git.kernel.org/stable/c/14c3188afbedfd5178bbabb8002487ea14b37b56)
- [CNA](https://git.kernel.org/stable/c/435d34719db0e130f6f0c621d67ed524cc1a7d10)
- [CNA](https://git.kernel.org/stable/c/68e32694be231c1cdb99b7637a657314e88e1a96)
- [CNA](https://git.kernel.org/stable/c/398e768d1accd1f5645492ab996005d7aa84a5b0)
- [CNA](https://git.kernel.org/stable/c/b0ea441f44ce64fa514a415d4a9e6e2b06e7946c)
- [CNA](https://git.kernel.org/stable/c/0ad7a1be44479503dbe5c699759861ef5b8bd70c)
- [CNA](https://git.kernel.org/stable/c/1732053c8a6b360e2d5afb1b34fe9779398b072c)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-082556.html)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-019113.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.12%
- **EPSS Percentile:** 2.2

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._