What is CVE-2009-0746?

CVE-2009-0746 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.9 out of 10, classified as a Improper Input Validation flaw (CWE-20). CVE-2009-0746 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2009-0746?

CVE-2009-0746 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-2009-0746?

No patch is currently available for CVE-2009-0746. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2009-0746 actively exploited?

CVE-2009-0746 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2009-0746

Medium

The make_indexed_dir function in fs/ext4/namei.c in the Linux kernel 2.6.27 before 2.6.27.19 and 2.6.28 before 2.6.28.7 does not validate a certain rec_len field, which allows local users to cause a denial of service (OOPS) by attempting to mount a crafted ext4 filesystem.

Package Linux Kernel

Published 2009-02-27

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-20

CVE-2009-0746 is a Improper Input Validation vulnerability

What is Improper Input Validation?

The product receives input but does not validate it correctly, allowing attackers to craft inputs that cause unexpected behavior. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2009-0746 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel.org
http://bugzilla.kernel.org/show_bug.cgi?id=12430
Kernel.org
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.19
Kernel.org
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.28.7
Osvdb
http://osvdb.org/52202
Red Hat
http://rhn.redhat.com/errata/RHSA-2009-1243.html
Secunia
http://secunia.com/advisories/34394
Secunia
http://secunia.com/advisories/36562
Secunia
http://secunia.com/advisories/37471
Debian Security
http://www.debian.org/security/2009/dsa-1749
Securityfocus
http://www.securityfocus.com/archive/1/507985/100/0/threaded
Ubuntu Security
http://www.ubuntu.com/usn/usn-751-1
Vmware
http://www.vmware.com/security/advisories/VMSA-2009-0016.html
Vupen
http://www.vupen.com/english/advisories/2009/0509

Vendor Advisory
Vupen
http://www.vupen.com/english/advisories/2009/3316
Exchange
https://exchange.xforce.ibmcloud.com/vulnerabilities/48872
Oval
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10342
Oval
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8039
Kernel patch commit
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=e6b8bc09ba2075cd91fbffefcd2778b1a00bd76f
Patch

Details

CVE ID CVE-2009-0746

Severity Medium

CVSS score 4.9 / 10

CVSS version 2.0

Published 2009-02-27

Modified 2026-04-23

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2009-0746?

CVE-2009-0746 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.9 out of 10 , classified as an Improper Input Validation flaw (CWE-20) . CVE-2009-0746 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2009-0746?

CVE-2009-0746 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-2009-0746?

No patch is currently available for CVE-2009-0746. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2009-0746 actively exploited?

No — CVE-2009-0746 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Improper Input Validation (CWE-20)?

The product receives input but does not validate it correctly, allowing attackers to craft inputs that cause unexpected behavior. View CWE-20 on MITRE CWE →