CVE-2018-7740 : What You Need to Know
Learn about CVE-2018-7740, a vulnerability in the Linux kernel up to version 4.15.7 that allows local users to trigger a denial of service. Find out how to mitigate and prevent this issue.
A vulnerability in the Linux kernel up to version 4.15.7 could allow local users to trigger a denial of service through a crafted application.
Understanding CVE-2018-7740
This CVE entry describes a vulnerability in the Linux kernel that could be exploited by local users to cause a denial of service (BUG) by utilizing specific system calls.
What is CVE-2018-7740?
The resv_map_release function in the hugetlb.c file within the Linux kernel, up to version 4.15.7, has a vulnerability that can be exploited by local users to trigger a denial of service (BUG). This can be achieved through a specifically crafted application that utilizes mmap system calls and includes a significant pgoff argument when invoking the remap_file_pages system call.
The Impact of CVE-2018-7740
The vulnerability allows local users to cause a denial of service on the affected systems, potentially disrupting normal operations and leading to system instability.
Technical Details of CVE-2018-7740
This section provides more in-depth technical details about the vulnerability.
Vulnerability Description
The resv_map_release function in mm/hugetlb.c in the Linux kernel through 4.15.7 allows local users to cause a denial of service (BUG) via a crafted application that makes mmap system calls and has a large pgoff argument to the remap_file_pages system call.
Affected Systems and Versions
- Linux kernel up to version 4.15.7
Exploitation Mechanism
The vulnerability can be exploited by local users through a specifically crafted application that utilizes mmap system calls and includes a significant pgoff argument when invoking the remap_file_pages system call.
Mitigation and Prevention
Protecting systems from CVE-2018-7740 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply security patches provided by the Linux kernel maintainers and relevant vendors
- Monitor system logs for any unusual activities that could indicate exploitation
Long-Term Security Practices
- Implement the principle of least privilege to restrict user access
- Regularly update and patch the Linux kernel and associated software
Patching and Updates
- Keep the Linux kernel up to date with the latest security patches and updates to mitigate the vulnerability effectively.