CVE-2009-3624

What it is

The get_instantiation_keyring function in security/keys/keyctl.c in the KEYS subsystem in the Linux kernel before 2.6.32-rc5 does not properly maintain the reference count of a keyring, which allows local users to gain privileges or cause a denial of service (OOPS) via vectors involving calls to this function without specifying a keyring by ID, as demonstrated by a series of keyctl request2 and keyctl list commands.

At a glance

Exploitability

Can be exploited locally on the machine without logging in. Limited direct impact.

Exploit odds

0.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2009-11-02 15:30 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 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: 4.6 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2009-11-02 15:30 UTC

Last modified

2026-06-16 23:12 UTC

Exploit probability

0.4% · EPSS, next 30 days

Weakness

CWE-310

Record status

Modified

Affected

• Linux Kernel 2.6.24.7
• Linux Kernel 2.6.25.15
• Linux Kernel ≤ 2.6.32
• Linux Kernel 2.6
• Linux Kernel 2.6.0
• Linux Kernel 2.6.1
• Linux Kernel 2.6.2
• Linux Kernel 2.6.2.27.13

Attack profile CVSS 2.0 · 4.6

Attack vector

Local

Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

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-2009-3624.md and follow it. Check whether this project is affected by CVE-2009-3624. 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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