CVE-2009-4021

Medium

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.

Package Linux Kernel
Published 2009-11-25
Last modified 2026-04-23
CVSS version 2.0
Patch available
Awaiting data

CVSS 2.0 score

4.9

out of 10
Medium
Attack Vector
Local
Attack Complexity
Low
Privileges Required
User Interaction
Scope
Confidentiality
Low
Integrity
None
Availability
Vector string
AV:L/AC:L/Au:N/C:N/I:N/A:C

Weakness type

CWE-399

CVE-2009-4021 is classified as CWE-399

See CWE-399 on MITRE CWE for full details on this weakness type.

References

The following references provide additional information about CVE-2009-4021 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Frequently asked questions

  • What is CVE-2009-4021?

    CVE-2009-4021 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.9 out of 10 . CVE-2009-4021 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2009-4021?

    CVE-2009-4021 has a CVSS score of 4.9 out of 10, rated Medium severity (CVSS 2.0). The vector string is AV:L/AC:L/Au:N/C:N/I:N/A:C .

  • Is there a patch available for CVE-2009-4021?

    No patch is currently available for CVE-2009-4021. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

  • Is CVE-2009-4021 actively exploited?

    No — CVE-2009-4021 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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