Buffer overflow in Linux kernel - CVE-2011-4086

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Main Vulnerability Database Vulnerabilities #VU43919

Buffer overflow in Linux kernel - CVE-2011-4086

Published: July 3, 2012 / Updated: August 11, 2020


Vulnerability identifier: #VU43919
CSH Severity: Medium
CVSS v4: 6.9 [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]
CVE-ID: CVE-2011-4086
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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.


Affected software

Linux kernel
Amazon Linux AMI
Ubuntu
linux (Ubuntu package)
linux-image-2.6.32-345-ec2 (Ubuntu package)
linux-lts-backport-natty (Ubuntu package)
linux-lts-backport-oneiric (Ubuntu package)

How to mitigate CVE-2011-4086

Install update from vendor's website.

linux (Ubuntu package) - addressed in versions 2.6.24-31.101, 2.6.32-41.89, 2.6.38-15.59, 3.0.0-19.33
linux-image-2.6.32-345-ec2 (Ubuntu package) - update to 2.6.32-345.48
linux-lts-backport-natty (Ubuntu package) - update to 2.6.38-15.59~lucid1
linux-lts-backport-oneiric (Ubuntu package) - update to 3.0.0-19.33~lucid1

External References

Related Security Bulletins