CVE-2009-4307: Divide by Zero
Published Nov 23, 2009
·Updated
Description of problem: ext4: avoid divide by zero when trying to mount a corrupted file system If sloggroupsperflex is greater than 31, then groupsperflex will overflow and cause a divide by zero error. This can cause kernel BUG if such a file system is mounted. Upstream commit: http://git.kernel.org/linus/503358ae01b70ce6909d19dd01287093f6b6271c
References: http://bugzilla.kernel.org/showbug.cgi?id=14287 http://secunia.com/advisories/37658
Other sources
The ext4fillflexinfo function in fs/ext4/super.c in the Linux kernel before 2.6.32-git6 allows user-assisted remote attackers to cause a denial of service (divide-by-zero error and panic) via a malformed ext4 filesystem containing a super block with a large FLEXBG group size (aka sloggroupsperflex value).
— Red Hat
Affected Software
334 affected componentsFixes available
redhat/kernel<0:2.6.18-194.el5
0:2.6.18-194.el5
redhat/kernel<0:2.6.18-164.17.1.el5
0:2.6.18-164.17.1.el5
Linux Linux kernel=2.6.27.29
Linux Linux kernel=2.6.27.12
Linux Linux kernel=2.6.20.6
Linux Linux kernel=2.6.20.9
Linux Linux kernel=2.6.11
Linux Linux kernel=2.6.23.4
Linux Linux kernel=2.6.22.15
Linux Linux kernel=2.6.16.16
Linux Linux kernel=2.6.18.7
Linux Linux kernel=2.6.17.12
Linux Linux kernel=2.6.16.39
Linux Linux kernel=2.6.27.3
Linux Linux kernel=2.6.31
Linux Linux kernel=2.6.29.3
Linux Linux kernel=2.6.21
Linux Linux kernel=2.6.16.9
Linux Linux kernel=2.6.31-rc4
Linux Linux kernel=2.6.17.9
Linux Linux kernel=2.6.11.2
Linux Linux kernel=2.6.27.1
Linux Linux kernel=2.6.5
Linux Linux kernel=2.6.15.3
Linux Linux kernel=2.6.27.30
Linux Linux kernel=2.6.11.10
Linux Linux kernel=2.6.24.7
Linux Linux kernel=2.6.1
Linux Linux kernel=2.6.16.43
Linux Linux kernel=2.6.16.6
Linux Linux kernel=2.6.31.3
Linux Linux kernel=2.6.16.8
Linux Linux kernel=2.6.20.13
Linux Linux kernel=2.6.22.4
Linux Linux kernel=2.6.14.7
Linux Linux kernel=2.6.27.18
Linux Linux kernel=2.6.13
Linux Linux kernel=2.6.17.2
Linux Linux kernel=2.6.13.3
Linux Linux kernel=2.6.23.13
Linux Linux kernel=2.6.11.8
Linux Linux kernel=2.6.24.2
Linux Linux kernel=2.6.26.5
Linux Linux kernel=2.6.16.34
Linux Linux kernel=2.6.25.20
Linux Linux kernel=2.6.27.21
Linux Linux kernel=2.6.23.7
Linux Linux kernel=2.6.17.8
Linux Linux kernel=2.6.14.4
Linux Linux kernel=2.6.14
Linux Linux kernel=2.6.25.5
Linux Linux kernel=2.6.17.4
Linux Linux kernel=2.6.16.18
Linux Linux kernel=2.6.27.27
Linux Linux kernel=2.6.17.14
Linux Linux kernel=2.6.10
Linux Linux kernel=2.6.23.8
Linux Linux kernel=2.6.16.45
Linux Linux kernel=2.6.22.12
Linux Linux kernel=2.6.25.18
Linux Linux kernel=2.6.14.3
Linux Linux kernel=2.6.29
Linux Linux kernel=2.6.18.3
Linux Linux kernel=2.6.16.37
Linux Linux kernel=2.6.11.6
Linux Linux kernel=2.6.16.48
Linux Linux kernel=2.6.11.11
Linux Linux kernel=2.6.16.13
Linux Linux kernel=2.6.27.10
Linux Linux kernel=2.6.3
Linux Linux kernel=2.6.31.4
Linux Linux kernel=2.6.21.6
Linux Linux kernel=2.6.26.6
Linux Linux kernel=2.6.22.1
Linux Linux kernel=2.6.27.17
Linux Linux kernel=2.6.16.4
Linux Linux kernel=2.6.23.16
Linux Linux kernel=2.6.31.6
Linux Linux kernel=2.6.17.3
Linux Linux kernel=2.6.24.1
Linux Linux kernel=2.6.20.5
Linux Linux kernel=2.6.22
Linux Linux kernel=2.6.28.4
Linux Linux kernel=2.6.4
Linux Linux kernel=2.6.27.16
Linux Linux kernel=2.6.26
Linux Linux kernel=2.6.16.15
Linux Linux kernel=2.6.27.20
Linux Linux kernel=2.6.15.6
Linux Linux kernel=2.6.26.3
Linux Linux kernel=2.6.20.16
Linux Linux kernel=2.6.15.1
Linux Linux kernel=2.6.11.5
Linux Linux kernel=2.6.28.2
Linux Linux kernel=2.6.25.9
Linux Linux kernel=2.6.19.3
Linux Linux kernel=2.6.27.4
Linux Linux kernel=2.6.27
Linux Linux kernel=2.6.19.4
Linux Linux kernel=2.6.25.13
Linux Linux kernel=2.6.28.5
Linux Linux kernel=2.6.19.1
Linux Linux kernel=2.6.18.4
Linux Linux kernel=2.6.16.1
Linux Linux kernel=2.6.18.1
Linux Linux kernel=2.6.20.21
Linux Linux kernel=2.6.31-rc1
Linux Linux kernel=2.6.27.13
Linux Linux kernel=2.6.23.1
Linux Linux kernel=2.6.2
Linux Linux kernel=2.6.14.5
Linux Linux kernel=2.6.13.2
Linux Linux kernel=2.6.17.5
Linux Linux kernel=2.6.18.5
Linux Linux kernel=2.6.21.1
Linux Linux kernel=2.6.16.32
Linux Linux kernel=2.6.13.5
Linux Linux kernel=2.6.16.57
Linux Linux kernel=2.6.16.49
Linux Linux kernel=2.6.25.3
Linux Linux kernel=2.6.17
Linux Linux kernel=2.6.24
Linux Linux kernel=2.6.31-rc6
Linux Linux kernel=2.6.31.1
Linux Linux kernel=2.6.19.2
Linux Linux kernel=2.6.26.2
Linux Linux kernel=2.6.21.4
Linux Linux kernel=2.6.16.11
Linux Linux kernel=2.6.20.17
Linux Linux kernel=2.6.16.14
Linux Linux kernel=2.6.20.12
Linux Linux kernel=2.6.16.25
Linux Linux kernel=2.6.27.15
Linux Linux kernel=2.6.16.21
Linux Linux kernel=2.6.16.33
Linux Linux kernel=2.6.30.7
Linux Linux kernel=2.6.8
Linux Linux kernel=2.6.16.28
Linux Linux kernel=2.6.17.10
Linux Linux kernel=2.6.21.5
Linux Linux kernel=2.6.25.15
Linux Linux kernel=2.6.14.1
Linux Linux kernel=2.6.23.15
Linux Linux kernel=2.6.16.23
Linux Linux kernel=2.6.29.4
Linux Linux kernel=2.6.12.5
Linux Linux kernel=2.6.15.7
Linux Linux kernel=2.6.20
Linux Linux kernel=2.6.23.10
Linux Linux kernel=2.6.22.7
Linux Linux kernel=2.6.27.26
Linux Linux kernel=2.6.16.3
Linux Linux kernel=2.6.27.8
Linux Linux kernel=2.6.26.1
Linux Linux kernel=2.6.25.19
Linux Linux kernel=2.6.20.20
Linux Linux kernel=2.6.16.36
Linux Linux kernel=2.6.30.8
Linux Linux kernel=2.6.14.6
Linux Linux kernel=2.6.12.1
Linux Linux kernel=2.6.27.9
Linux Linux kernel=2.6.11.9
Linux Linux kernel=2.6.16.46
Linux Linux kernel=2.6.17.1
Linux Linux kernel=2.6.20.8
Linux Linux kernel=2.6.27.25
Linux Linux kernel=2.6.30.9
Linux Linux kernel=2.6.20.15
Linux Linux kernel=2.6.22.18
Linux Linux kernel=2.6.0
Linux Linux kernel=2.6.25.8
Linux Linux kernel=2.6.16.54
Linux Linux kernel=2.6.13.4
Linux Linux kernel=2.6.20.18
Linux Linux kernel=2.6.23.9
Linux Linux kernel=2.6.22.6
Linux Linux kernel=2.6.23.3
Linux Linux kernel=2.6.18.8
Linux Linux kernel=2.6.22.3
Linux Linux kernel=2.6.12.2
Linux Linux kernel=2.6.16.31
Linux Linux kernel=2.6.16.26
Linux Linux kernel=2.6.16.62
Linux Linux kernel=2.6.18.2
Linux Linux kernel=2.6.28.8
Linux Linux kernel=2.6.31-rc5
Linux Linux kernel=2.6.16.29
Linux Linux kernel=2.6.29.1
Linux Linux kernel=2.6.24.4
Linux Linux kernel=2.6.27.19
Linux Linux kernel=2.6.25.16
Linux Linux kernel=2.6.22.9
Linux Linux kernel=2.6.25.17
Linux Linux kernel=2.6.20.11
Linux Linux kernel=2.6.19
Linux Linux kernel=2.6.20.3
Linux Linux kernel=2.6.16
Linux Linux kernel=2.6.30.4
Linux Linux kernel=2.6.28.3
Linux Linux kernel=2.6.22.13
Linux Linux kernel=2.6.19.7
Linux Linux kernel=2.6.21.3
Linux Linux kernel=2.6.27.28
Linux Linux kernel=2.6.24.5
Linux Linux kernel=2.6.16.51
Linux Linux kernel=2.6.15.2
Linux Linux kernel=2.6.20.19
Linux Linux kernel=2.6.16.22
Linux Linux kernel=2.6.22.17
Linux Linux kernel=2.6.16.58
Linux Linux kernel=2.6.16.40
Linux Linux kernel=2.6.16.47
Linux Linux kernel=2.6.16.42
Linux Linux kernel=2.6.27.22
Linux Linux kernel=2.6.23.14
Linux Linux kernel=2.6.17.11
Linux Linux kernel=2.6.16.10
Linux Linux kernel=2.6.12.4
Linux Linux kernel=2.6.16.41
Linux Linux kernel=2.6.16.52
Linux Linux kernel=2.6.11.3
Linux Linux kernel=2.6.20.10
Linux Linux kernel=2.6.16.24
Linux Linux kernel=2.6.31-rc7
Linux Linux kernel=2.6.25.10
Linux Linux kernel=2.6.22.11
Linux Linux kernel=2.6.16.55
Linux Linux kernel=2.6.23
Linux Linux kernel=2.6.12.3
Linux Linux kernel=2.6.22.10
Linux Linux kernel=2.6.29.6
Linux Linux kernel=2.6.23.17
Linux Linux kernel=2.6.27.5
Linux Linux kernel=2.6.23.2
Linux Linux kernel=2.6.25.1
Linux Linux kernel=2.6.25.4
Linux Linux kernel=2.6.28.9
Linux Linux kernel=2.6.30.2
Linux Linux kernel=2.6.7
Linux Linux kernel=2.6.21.7
Linux Linux kernel=2.6.30.6
Linux Linux kernel=2.6.16.30
Linux Linux kernel<=2.6.32
Linux Linux kernel=2.6.21.2
Linux Linux kernel=2.6.15.4
Linux Linux kernel=2.6.27.7
Linux Linux kernel=2.6.16.59
Linux Linux kernel=2.6.30.1
Linux Linux kernel=2.6.16.38
Linux Linux kernel=2.6.16.17
Linux Linux kernel=2.6.26.8
Linux Linux kernel=2.6.20.2
Linux Linux kernel=2.6.28.6
Linux Linux kernel=2.6.16.12
Linux Linux kernel=2.6.31.5
Linux Linux kernel=2.6.16.27
Linux Linux kernel=2.6.16.53
Linux Linux kernel=2.6.28.7
Linux Linux kernel=2.6.12.6
Linux Linux kernel=2.6.31-rc8
Linux Linux kernel=2.6.17.7
Linux Linux kernel=2.6.20.1
Linux Linux kernel=2.6.11.7
Linux Linux kernel=2.6.16.2
Linux Linux kernel=2.6.24.6
Linux Linux kernel=2.6.31-rc3
Linux Linux kernel=2.6.18.6
Linux Linux kernel=2.6.15
Linux Linux kernel=2.6.16.44
Linux Linux kernel=2.6.23.12
Linux Linux kernel=2.6.16.35
Linux Linux kernel=2.6.19.6
Linux Linux kernel=2.6.16.50
Linux Linux kernel=2.6.25.11
Linux Linux kernel=2.6.27.31
Linux Linux kernel=2.6.29.2
Linux Linux kernel=2.6.23.5
Linux Linux kernel=2.6.22.8
Linux Linux kernel=2.6.14.2
Linux Linux kernel=2.6.16.61
Linux Linux kernel=2.6.31-rc2
Linux Linux kernel=2.6.19.5
Linux Linux kernel=2.6.18
Linux Linux kernel=2.6.27.24
Linux Linux kernel=2.6.20.4
Linux Linux kernel=2.6.17.6
Linux Linux kernel=2.6.23.6
Linux Linux kernel=2.6.27.2
Linux Linux kernel=2.6.16.7
Linux Linux kernel=2.6.17.13
Linux Linux kernel=2.6.16.60
Linux Linux kernel=2.6.22.2
Linux Linux kernel=2.6.8.1
Linux Linux kernel=2.6.27.11
Linux Linux kernel=2.6.16.56
Linux Linux kernel=2.6.22.19
Linux Linux kernel=2.6.24.3
Linux Linux kernel=2.6.31.2
Linux Linux kernel=2.6.25
Linux Linux kernel=2.6.20.14
Linux Linux kernel=2.6.25.2
Linux Linux kernel=2.6.22.5
Linux Linux kernel=2.6.25.7
Linux Linux kernel=2.6.30.5
Linux Linux kernel=2.6.25.14
Linux Linux kernel=2.6.20.7
Linux Linux kernel=2.6.28.1
Linux Linux kernel=2.6.16.5
Linux Linux kernel=2.6.30
Linux Linux kernel=2.6.11.4
Linux Linux kernel=2.6.26.4
Linux Linux kernel=2.6.25.12
Linux Linux kernel=2.6.16.19
Linux Linux kernel=2.6.27.6
Linux Linux kernel=2.6.26.7
Linux Linux kernel=2.6.25.6
Linux Linux kernel=2.6.11.12
Linux Linux kernel=2.6.16.20
Linux Linux kernel=2.6.15.5
Linux Linux kernel=2.6.30-rc7-git6
Linux Linux kernel=2.6.28.10
Linux Linux kernel=2.6.22.16
Linux Linux kernel=2.6.11.1
Linux Linux kernel=2.6.30.3
Linux Linux kernel=2.6.9
Linux Linux kernel=2.6.27.23
Linux Linux kernel=2.6.13.1
Linux Linux kernel=2.6.23.11
Linux Linux kernel=2.6.27.14
Linux Linux kernel=2.6.28
Linux Linux kernel=2.6.29.5
Linux Linux kernel=2.6.22.14
Linux Linux kernel=2.6.6
Linux Linux kernel=2.6.12
Remediation
Patch Available
Event History
Nov 23, 2009
CVE Published
via Red Hat·12:00 AM
Dec 13, 2009
CVE Published
via MITRE·01:00 AM
Data Sourced
via MITRE·01:00 AM
Description
Dec 14, 2009
Data Sourced
via Red Hat·05:47 AM
DescriptionSeverityAffected Software
Parent advisories
This vulnerability appears in the following advisories.
Frequently Asked Questions
1
What is the severity of CVE-2009-4307?
CVE-2009-4307 has a high severity level due to the potential for a kernel BUG and system instability when mounting a corrupted file system.
2
How do I fix CVE-2009-4307?
To fix CVE-2009-4307, update the Linux kernel to a patched version that addresses the divide by zero vulnerability.
3
What software is affected by CVE-2009-4307?
CVE-2009-4307 affects specific versions of the Linux kernel, particularly those lower than 2.6.32 and certain Red Hat kernel versions.
4
What are the consequences of CVE-2009-4307?
The consequences of CVE-2009-4307 include potential system crashes and instability when attempting to mount corrupted file systems.
5
Is there a workaround for CVE-2009-4307?
The primary workaround for CVE-2009-4307 is to avoid mounting any untrusted or corrupted file systems until a patch has been applied.