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CVE-2009-4021

4.9 · 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) v…

Published Nov 25, 2009linuxCWE-399EPSS 0.41%

Overview

CVE-2009-4021 is a medium-severity vulnerability affecting linux linux_kernel. It was published on November 25, 2009 and has a CVSS 2.0 base score of 4.9 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 4.9, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
linuxlinux_kernel0Affected

References

Refgit.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f60311d5f7670d9539b424e4ed8b5c0872fc9e83Reflists.opensuse.org/opensuse-security-announce/2009-12/msg00002.htmlReflists.opensuse.org/opensuse-security-announce/2009-12/msg00005.htmlReflists.opensuse.org/opensuse-security-announce/2010-01/msg00000.htmlReflists.opensuse.org/opensuse-security-announce/2010-02/msg00005.htmlRefsecunia.com/advisories/37909Refsecunia.com/advisories/38017Refsupport.avaya.com/css/P8/documents/100073666Refwww.debian.org/security/2010/dsa-2005Refwww.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.32-rc7

How CyberStrike helps

Frequently asked questions

What is CVE-2009-4021?

CVE-2009-4021 is a medium-severity vulnerability affecting linux linux_kernel. It was published on November 25, 2009 and has a CVSS 2.0 base score of 4.9 (MEDIUM).

How severe is CVE-2009-4021?

This vulnerability has a CVSS 2.0 base score of 4.9, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2009-4021?

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-4021?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-4021 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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