# What is CVE-2009-1186?

> CVE-2009-1186 is a low-severity flaw (CVSS 2.1) in Udev from Udev Project, published on 17 April 2009. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 0.5%. If you run an affected version, plan in the vendor’s fix.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2009-1186

## At a glance

- **Verdict:** Plan it in. No sign of exploitation and a low forecast. Patch it in your normal update cycle.
- **Precursor Intelligence risk score:** 9 out of 100 (Info); action: Track. Kept up to date as the evidence changes.
- **Severity:** Low (CVSS 2.1 out of 10)
- **Known to be exploited:** No, not on the list of flaws known to be exploited today
- **Chance of use in the next 30 days:** 0.5% (latest exploit-likelihood forecast)
- **Published:** 17 April 2009
- **Record last updated:** 16 June 2026
- **Main product:** Udev from Udev Project
- **Affected products:** 8

## What is CVE-2009-1186? In plain terms

An attacker has to be already on the device without logging in. If it works, the attacker can slow it down.

### The official description

Buffer overflow in the util_path_encode function in udev/lib/libudev-util.c in udev before 1.4.1 allows local users to cause a denial of service (service outage) via vectors that trigger a call with crafted arguments.

### What kind of flaw is it?

- CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

### How an attack on it works

- Where an attacker can be: Already on the device
- How hard it is to pull off: Easy: no special conditions
- Login needed first: No login needed
- What an attacker gets: Can slow it down

Severity vector: `AV:L/AC:L/Au:N/C:N/I:N/A:P`

## Is CVE-2009-1186 being exploited? Not that we know of

It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 0.5%. That can change at any time, which is why we keep watching.

Exploit likelihood over the last 7 days: 0.5%, 0.5%, 0.5%, 0.5%, 0.5%, 0.5%, 0.5%.

### Timeline

- 17 April 2009: Published
- 16 June 2026: Record last updated

### How Precursor Intelligence ranks it

CVE-2009-1186 scores **9 out of 100 (Info)**, with the action "Track".

Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less:

- Evidence it is being exploited: biggest factor
- How severe it is: strong factor
- How widely exposed it is: smaller factor
- Threat activity around it: smaller factor

85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it.

## Who is affected by CVE-2009-1186?

The published record lists 8 products. Versions are as published: "before 141" means every version up to, but not including, 141.

- [Udev](https://www.precursorintelligence.com/product/udev_project/udev) by [Udev Project](https://www.precursorintelligence.com/vendors/udev_project) (Application): before 141
- [Ubuntu Linux](https://www.precursorintelligence.com/product/canonical/ubuntu_linux) by [Canonical](https://www.precursorintelligence.com/vendors/canonical) (Operating system): 6.06, 7.10, 8.04, 8.10
- [Opensuse](https://www.precursorintelligence.com/product/opensuse/opensuse) by [Opensuse](https://www.precursorintelligence.com/vendors/opensuse) (Operating system): 10.3, 11.0, 11.1
- [Debian Linux](https://www.precursorintelligence.com/product/debian/debian_linux) by [Debian](https://www.precursorintelligence.com/vendors/debian) (Operating system): 4.0, 5.0
- [Fedora](https://www.precursorintelligence.com/product/fedoraproject/fedora) by [Fedoraproject](https://www.precursorintelligence.com/vendors/fedoraproject) (Operating system): 9, 10
- [Linux Enterprise Debuginfo](https://www.precursorintelligence.com/product/suse/linux_enterprise_debuginfo) by [Suse](https://www.precursorintelligence.com/vendors/suse) (Application): 10-sp2, 11
- [Linux Enterprise Desktop](https://www.precursorintelligence.com/product/suse/linux_enterprise_desktop) by [Suse](https://www.precursorintelligence.com/vendors/suse) (Operating system): 10-sp2, 11
- [Linux Enterprise Server](https://www.precursorintelligence.com/product/suse/linux_enterprise_server) by [Suse](https://www.precursorintelligence.com/vendors/suse) (Operating system): 10-sp2, 11

## How do I fix CVE-2009-1186?

1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list.
2. **Apply the vendor’s fix.** Install the update named in the vendor’s advisory. We’ve put the advisory first in the list.
3. **If you can’t patch today.** Follow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in.
4. **Keep an eye on it.** Track the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood.

### References

- [bugzilla.redhat.com](https://bugzilla.redhat.com/show_bug.cgi?id=495052) (Issue tracking, Patch, Third-party advisory)
- [git.kernel.org](http://git.kernel.org/?p=linux/hotplug/udev.git%3Ba=commitdiff%3Bh=662c3110803bd8c1aedacc36788e6fd028944314)
- [lists.opensuse.org](http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00006.html) (Mailing list, Third-party advisory)
- [secunia.com](http://secunia.com/advisories/34731) (Not applicable)
- [secunia.com](http://secunia.com/advisories/34750) (Not applicable)
- [secunia.com](http://secunia.com/advisories/34753) (Not applicable)
- [secunia.com](http://secunia.com/advisories/34771) (Not applicable)
- [secunia.com](http://secunia.com/advisories/34776) (Not applicable)
- [secunia.com](http://secunia.com/advisories/34785) (Not applicable)
- [secunia.com](http://secunia.com/advisories/34787) (Not applicable)
- [secunia.com](http://secunia.com/advisories/34801) (Not applicable)
- [slackware.com](http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.446399) (Third-party advisory)
- [wiki.rpath.com](http://wiki.rpath.com/Advisories:rPSA-2009-0063) (Broken link)
- [wiki.rpath.com](http://wiki.rpath.com/wiki/Advisories:rPSA-2009-0063) (Broken link)
- [debian.org](http://www.debian.org/security/2009/dsa-1772) (Third-party advisory)
- [gentoo.org](http://www.gentoo.org/security/en/glsa/glsa-200904-18.xml) (Third-party advisory)
- [mandriva.com](http://www.mandriva.com/security/advisories?name=MDVSA-2009:103) (Broken link)
- [securityfocus.com](http://www.securityfocus.com/archive/1/502752/100/0/threaded) (Third-party advisory, Vulnerability database)
- [securityfocus.com](http://www.securityfocus.com/bid/34539) (Third-party advisory, Vulnerability database)
- [securitytracker.com](http://www.securitytracker.com/id?1022068) (Broken link, Third-party advisory, Vulnerability database)
- [ubuntu.com](http://www.ubuntu.com/usn/usn-758-1) (Third-party advisory)
- [vupen.com](http://www.vupen.com/english/advisories/2009/1053) (Permissions required)
- [launchpad.net](https://launchpad.net/bugs/cve/2009-1186) (Third-party advisory)
- [redhat.com](https://www.redhat.com/archives/fedora-package-announce/2009-April/msg00462.html) (Mailing list, Third-party advisory)
- [redhat.com](https://www.redhat.com/archives/fedora-package-announce/2009-April/msg00463.html) (Mailing list, Third-party advisory)

## Questions

### What is CVE-2009-1186?

CVE-2009-1186 is a low-severity flaw in Udev from Udev Project, published on 17 April 2009. An attacker has to be already on the device without logging in. If it works, the attacker can slow it down.

### How serious is CVE-2009-1186?

It scores 2.1 out of 10 on the CVSS severity scale, which is low. Our risk score for CVE-2009-1186 is 9 out of 100, which is Info. Its action is "Track". No sign of exploitation and a low forecast. Patch it in your normal update cycle.

### Is CVE-2009-1186 being exploited?

It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 0.5%. That can change at any time, which is why we keep watching.

### Which versions does CVE-2009-1186 affect?

For Udev from Udev Project: before 141. The record lists 8 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2009-1186?

Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet.

## Does CVE-2009-1186 affect you?

Precursor Intelligence keeps checking for you:

- **Tell us what you run.** Pick your software from a list, or let us work it out from your website.
- **We match it to every flaw.** Over 400,000 published flaws, checked against your list.
- **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it.
- **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools.

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