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. 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?

Monitor the NIST NVD and your Linux distribution's security advisories for CVE-2009-4021 patch availability.

Is CVE-2009-4021 actively exploited?

CVE-2009-4021 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

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

20 total

Showing 5 of 20 references View all on NVD

Details

CVE ID CVE-2009-4021

Severity Medium

CVSS score 4.9 / 10

CVSS version 2.0

Published 2009-11-25

Modified 2026-04-23

KEV No

Patch Awaiting data

Package linux

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?

Monitor the NIST NVD and your Linux distribution's security advisories for CVE-2009-4021 patch availability.
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.