CVE-2009-4021

4.9 MEDIUM 0.4% exploit odds No fix listed

What it is

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.

At a glance

Exploitability: Can be exploited locally on the machine without logging in. High risk of service disruption.
Exploit odds: 0.4% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2009-11-25 16:30 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 23:12 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.4% in the next 30 days (EPSS).
Severity: 4.9 MEDIUM (CVSS).
Fix: none linked yet, which raises it.

Details

Published: 2009-11-25 16:30 UTC
Last modified: 2026-06-16 23:12 UTC
Exploit probability: 0.4% · EPSS, next 30 days
Weakness: CWE-399
Record status: Modified

Affected

Linux Kernel ≤ 2.6.32
Linux Kernel 2.6.0
Linux Kernel 2.6.1
Linux Kernel 2.6.2
Linux Kernel 2.6.3
Linux Kernel 2.6.4
Linux Kernel 2.6.5
Linux Kernel 2.6.6

Attack profile CVSS 2.0 · 4.9

Attack vector: Local
Complexity: Low
Authentication: None
Confidentiality: None
Integrity: None
Availability: Complete

Raw vector

AV:L/AC:L/Au:N/C:N/I:N/A:C

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2009-4021.md and follow it. Check whether this project is affected by CVE-2009-4021. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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References

NVD record · CVE.org record