Buffer overflow in Linux kernel

1) Buffer overflow

EUVDB-ID: #VU43919

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2011-4086

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The journal_unmap_buffer function in fs/jbd2/transaction.c in the Linux kernel before 3.3.1 does not properly handle the _Delay and _Unwritten buffer head states, which allows local users to cause a denial of service (system crash) by leveraging the presence of an ext4 filesystem that was mounted with a journal.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 3.0 - 3.2.20

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:3.0:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:3.0.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:3.0.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:3.0.3:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:3.0.4:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:3.0.5:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:3.0.6:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:3.0.7:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:3.0.8:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:3.0.9:*:*:*:*:*:*:*

External links

https://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=15291164b22a357cb211b618adfef4fa82fc0de3
https://lists.opensuse.org/opensuse-security-announce/2012-04/msg00021.html
https://lists.opensuse.org/opensuse-security-announce/2012-05/msg00013.html
https://rhn.redhat.com/errata/RHSA-2012-0571.html
https://rhn.redhat.com/errata/RHSA-2012-0670.html
https://secunia.com/advisories/48898
https://secunia.com/advisories/48964
https://www.debian.org/security/2012/dsa-2469
https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.3.1
https://bugzilla.redhat.com/show_bug.cgi?id=749143
https://github.com/torvalds/linux/commit/15291164b22a357cb211b618adfef4fa82fc0de3

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.