CVE-2009-0747

Severity: medium (CVSS 4.9 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2009-02-27 · updated 2026-06-16
Weakness: CWE-399

Description

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.

Affected products

Linux kernel: 2.6.27, 2.6.27-rc1, 2.6.27-rc2, 2.6.27-rc3, 2.6.27-rc4, 2.6.27-rc5 (+36)

References

http://bugzilla.kernel.org/show_bug.cgi?id=12375
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=06a279d636734da32bb62dd2f7b0ade666f65d7c
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.19
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.28.7
http://rhn.redhat.com/errata/RHSA-2009-1243.html
http://secunia.com/advisories/34394
http://secunia.com/advisories/36562
http://secunia.com/advisories/37471
http://www.debian.org/security/2009/dsa-1749
http://www.securityfocus.com/archive/1/507985/100/0/threaded
http://www.ubuntu.com/usn/usn-751-1
http://www.vmware.com/security/advisories/VMSA-2009-0016.html

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