CVE-2009-0747 json
The ext4_isize function in fs/ext4/ext4.h in the Linux kernel 2.6.27 before 2.6.27.19 and 2.6.28 before 2.6.28.7 uses the i_size_high struc…
published 2009-02-27 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-0747
- cvss
- 4.9
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 35%
- public exploits
- 0
- none known
Summary
The ext4_isize function in fs/ext4/ext4.h in the Linux kernel 2.6.27 before 2.6.27.19 and 2.6.28 before 2.6.28.7 uses the i_size_high structure member during operations on arbitrary types of files, which allows local users to cause a denial of service (CPU consumption and error-message flood) by attempting to mount a crafted ext4 filesystem.
Patch / fix
- kernel RHEL 5 2.6.18-164.el5
- kernel-PAE RHEL 5 2.6.18-164.el5
- kernel-xen RHEL 5 2.6.18-164.el5
- kernel-kdump RHEL 5 2.6.18-164.el5
- kernel-debuginfo-common RHEL 5 2.6.18-164.el5
red hat advisories RHSA-2009:1243
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2009-0747 updated cvss 4.9
kernel: ext4: ext4_isize() denial of service
-
Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-164.el5, kernel-PAE 2.6.18-164.el5, kernel-xen 2.6.18-164.el5, kernel-kdump 2.6.18-164.el5, kernel-debuginfo-common 2.6.18-164.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-164.el5, kernel-PAE 2.6.18-164.el5, kernel-xen 2.6.18-164.el5, kernel-kdump 2.6.18-164.el5, kernel-debuginfo-common 2.6.18-164.el5fixed: vendor fix RHSA-2009:1243
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 4.9 | AV:L/AC:L/Au:N/C:N/I:N/A:C |
Classification
- Weakness
-
- CWE-399 Resource Management Errors
- Technology feeds
References
-
bugzilla.kernel.org
/show_bug.cgi?id=12375
patch
-
rhn.redhat.com
/errata/RHSA-2009-1243.html
vendor-advisory
-
debian.org
/security/2009/dsa-1749
vendor-advisory
-
ubuntu.com
/usn/usn-751-1
vendor-advisory
-
vupen.com
/english/advisories/2009/0509
vdb-entry, vendor-advisory
- kernel.org /pub/linux/kernel/v2.6/ChangeLog-2.6.27.19
-
secunia.com
/advisories/37471
third-party-advisory
- git.kernel.org /?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=06a279d636734da32bb62dd2f7b0ade666f65d7c
- vmware.com /security/advisories/VMSA-2009-0016.html
-
oval.cisecurity.org
/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8585
vdb-entry, signature
-
securityfocus.com
/archive/1/507985/100/0/threaded
mailing-list
-
secunia.com
/advisories/36562
third-party-advisory
-
oval.cisecurity.org
/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9200
vdb-entry, signature
-
secunia.com
/advisories/34394
third-party-advisory
- kernel.org /pub/linux/kernel/v2.6/ChangeLog-2.6.28.7
-
vupen.com
/english/advisories/2009/3316
vdb-entry
Sources
- CVE List CVE-2009-0747
- NVD CVE-2009-0747
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