---
id: CVE-2026-72200
title: 'ntfs: detect mapping-pairs LCN accumulator overflow'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ntfs: detect mapping-pairs LCN accumulator overflow

  The NTFS mapping-pairs parser accumulates relative LCN deltas in a
  signed integer.  A corrupted attribute can drive…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    6626fb859f4c4772f2f59751d23937716e03f98f
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89
  - >-
    Linux >= 1e9ea7e04472d4e5e12e58c881eaacfb3e49b669 <
    7fb64788812d137b37f6d8724e1e41c624c1e814
  - >-
    Linux >= 1e9ea7e04472d4e5e12e58c881eaacfb3e49b669 <
    ec4f061f2219e0f0c6465d56d0380bf749235a53
  - Linux 2.6.12
  - Linux 7.1
published: '2026-08-15'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:44:27.417Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-72200'
references:
  - url: 'https://git.kernel.org/stable/c/6626fb859f4c4772f2f59751d23937716e03f98f'
  - url: 'https://git.kernel.org/stable/c/7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89'
  - url: 'https://git.kernel.org/stable/c/7fb64788812d137b37f6d8724e1e41c624c1e814'
  - url: 'https://git.kernel.org/stable/c/ec4f061f2219e0f0c6465d56d0380bf749235a53'
tags:
  - cve.org
epss: 0.00649
epssPercentile: 0.50212
ingestedAt: '2026-10-21T12:48:53.593Z'
---

## Overview

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

ntfs: detect mapping-pairs LCN accumulator overflow

The NTFS mapping-pairs parser accumulates relative LCN deltas in a
signed integer.  A corrupted attribute can drive that addition past
the representable range.

One corrupt runlist shape sets the accumulated LCN to S64_MAX and
then adds a delta of 1 in the next mapping-pairs entry.

Signed overflow is undefined and can turn an invalid runlist into a
different set of physical clusters.

Check the LCN addition for overflow before storing the next run.

## Affected

- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6626fb859f4c4772f2f59751d23937716e03f98f`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89`
- `Linux >= 1e9ea7e04472d4e5e12e58c881eaacfb3e49b669 < 7fb64788812d137b37f6d8724e1e41c624c1e814`
- `Linux >= 1e9ea7e04472d4e5e12e58c881eaacfb3e49b669 < ec4f061f2219e0f0c6465d56d0380bf749235a53`
- `Linux 2.6.12`
- `Linux 7.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.