Divide By Zero in Linux kernel - CVE-2012-2100
Published: January 11, 2017 / Updated: March 16, 2017
Vulnerability identifier: #VU4198
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2012-2100
CWE-ID: CWE-369
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
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.
Affected software
Linux kernel
How to mitigate CVE-2012-2100
Install update from vendor's website.