SB2012040401 - Denial of service in Linux kernel
Published: April 4, 2012 Updated: March 14, 2017
Security Bulletin ID
SB2012040401
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Divide By Zero (CVE-ID: CVE-2012-2100)
The vulnerability allows a local attacker to cause DoS condition on the target system.The weakness exists due to divide-by-zero error in the ext4_fill_flex_info() function. By using a malformed ext4 filesystem containing a super block with a large FLEX_BG group size (aka s_log_groups_per_flex value), a local attacker can trigger kernel panic.
Successful exploitation of the vulnerability results in denial of service on the vulnerable system.
Note: the vulnerability was being actively exploited.
Remediation
Install update from vendor's website.