# CVE-2026-72200: ntfs: detect mapping-pairs LCN accumulator overflow

CVE-2026-72200 is fixed in linux on 1 platform by DEBIAN-CVE-2026-72200 (version 7.1.5-1), released August 15, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-72200
- Priority: High
- CVSS: 9.8 (Moderate)
- EPSS: 0.0067
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 15, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72200

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.1.5-1 | [DEBIAN-CVE-2026-72200](https://patchblox.com/security/data/fix/linux/debian-cve-2026-72200.md) | Aug 15, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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