ntfs: detect mapping-pairs LCN accumulator overflow
CVE-2026-72200 · published 15 Aug 2026
How serious is it
- Severity: critical, CVSS score 9.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-72200?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 6626fb859f4c4772f2f59751d23937716e03f98f, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89, 1e9ea7e04472d4e5e12e58c881eaacfb3e49b669 to < 7fb64788812d137b37f6d8724e1e41c624c1e814, 1e9ea7e04472d4e5e12e58c881eaacfb3e49b669 to < ec4f061f2219e0f0c6465d56d0380bf749235a53
- Linux Linux: 2.6.12, 7.1
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/6626fb859f4c4772f2f59751d23937716e03f98f
- git.kernel.org/stable/c/7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89
- git.kernel.org/stable/c/7fb64788812d137b37f6d8724e1e41c624c1e814
- git.kernel.org/stable/c/ec4f061f2219e0f0c6465d56d0380bf749235a53
Merged from CVE List. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON