NULL pointer dereference in Linux kernel - CVE-2011-2928
Published: August 29, 2011 / Updated: August 11, 2020
Vulnerability identifier: #VU44768
CSH Severity: Medium
CVSS v4.0: 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-2011-2928
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2011-2928
Install update from vendor's website.
Sources
- 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