CVE-2017-12190 : What You Need to Know
Discover the impact of CVE-2017-12190, a Linux kernel vulnerability allowing memory leaks and system lockups. Learn about affected systems, exploitation, and mitigation steps.
In November 2017, a vulnerability was identified in the Linux kernel prior to version 4.13.8, affecting the block/bio.c file. This flaw could be exploited by a user within a guest operating system, potentially leading to an out-of-memory condition and system lockup.
Understanding CVE-2017-12190
This CVE entry pertains to a specific flaw in the Linux kernel that could result in a memory leak and system instability.
What is CVE-2017-12190?
The vulnerability in the Linux kernel prior to version 4.13.8 arises from improper handling of SCSI I/O vectors containing multiple small consecutive buffers on the same page. When these buffers are combined into a single page, a reference to the page is not correctly released, causing a memory leak.
The Impact of CVE-2017-12190
Exploitation of this vulnerability by a user within a guest operating system, particularly when a SCSI disk is directly passed to a virtual machine, can trigger an out-of-memory condition and potentially lead to a system lockup.
Technical Details of CVE-2017-12190
This section provides more in-depth technical insights into the vulnerability.
Vulnerability Description
The flaw resides in the block/bio.c file within the bio_map_user_iov and bio_unmap_user functions of the Linux kernel prior to version 4.13.8.
Affected Systems and Versions
- Product: Linux kernel through v4.14-rc5
- Versions: Linux kernel through v4.14-rc5
Exploitation Mechanism
The vulnerability can be exploited by a user within a guest operating system, especially when a SCSI disk is directly passed to a virtual machine.
Mitigation and Prevention
Protecting systems from CVE-2017-12190 involves taking immediate steps and implementing long-term security practices.
Immediate Steps to Take
- Apply relevant security updates and patches promptly.
- Monitor system resources to detect any unusual memory consumption.
Long-Term Security Practices
- Regularly update the Linux kernel to the latest stable version.
- Implement proper access controls and isolation mechanisms for virtual machines.
Patching and Updates
Ensure that all relevant security advisories and patches are applied to mitigate the risk of exploitation.