SB2011082902 - NULL pointer dereference in Linux kernel
Published: August 29, 2011 Updated: August 11, 2020
Security Bulletin ID
SB2011082902
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2011-2928)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The befs_follow_link function in fs/befs/linuxvfs.c in the Linux kernel before 3.1-rc3 does not validate the length attribute of long symlinks, which allows local users to cause a denial of service (incorrect pointer dereference and OOPS) by accessing a long symlink on a malformed Be filesystem.
Remediation
Install update from vendor's website.
References
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=338d0f0a6fbc82407864606f5b64b75aeb3c70f2
- http://securityreason.com/securityalert/8360
- http://www.kernel.org/pub/linux/kernel/v3.0/testing/ChangeLog-3.1-rc3
- http://www.openwall.com/lists/oss-security/2011/08/19/1
- http://www.openwall.com/lists/oss-security/2011/08/19/5
- http://www.pre-cert.de/advisories/PRE-SA-2011-06.txt
- http://www.securityfocus.com/archive/1/519387/100/0/threaded
- http://www.securityfocus.com/bid/49256
- https://exchange.xforce.ibmcloud.com/vulnerabilities/69343