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CVE-2009-0747

18
FAUCET Score

CVE-2009-0747 describes a denial-of-service vulnerability in the Linux kernel (versions 2.6.27 before 2.6.27.19 and 2.6.28 before 2.6.28.7) affecting the ext4 filesystem. A local attacker can trigger excessive CPU consumption and an error-message flood by attempting to mount a specially crafted ext4 filesystem. This vulnerability has a CVSS score of 4.9, indicating a low severity, with a local attack vector and low attack complexity, leading to a complete denial of service. There is no evidence of active exploitation, no public exploit code (Metasploit, Nuclei, ExploitDB), and minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
2.6.27CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:2.6.27:*:*:*:*:*:*:*
2.6.27CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:2.6.27:rc1:*:*:*:*:*:*
2.6.27CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:2.6.27:rc2:*:*:*:*:*:*
2.6.27CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:2.6.27:rc3:*:*:*:*:*:*
2.6.27CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:2.6.27:rc4:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.9MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Exploitability Score
3.9
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
0.41%
Probability of exploitation in next 30 days
EPSS Percentile
33.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0041 is in the 63rd percentile among its peer group of 3,052 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: kernel-0:2.6.18-164.el5
View patch

Vendor Advisories (1)

redhatCVE-2009-0747Low

kernel: ext4: ext4_isize() denial of service

Jan 7, 2009

References

bugzilla.kernel.org / show_bug.cgi
Patch
git.kernel.org
kernel.org / pub/linux/kernel/v2.6/ChangeLog-2.6.27.19
kernel.org / pub/linux/kernel/v2.6/ChangeLog-2.6.28.7
rhn.redhat.com / errata/RHSA-2009-1243.html
secunia.com / advisories/34394
secunia.com / advisories/36562
secunia.com / advisories/37471
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8585
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9200
debian.org / security/2009/dsa-1749
securityfocus.com / archive/1/507985/100/0/threaded
ubuntu.com / usn/usn-751-1
vmware.com / security/advisories/VMSA-2009-0016.html
vupen.com / english/advisories/2009/0509
Vendor Advisory
vupen.com / english/advisories/2009/3316