CVE-2019-11487 : Vulnerability Insights and Analysis
Learn about CVE-2019-11487, a Linux kernel vulnerability that can lead to use-after-free issues. Find out the affected systems, exploitation mechanism, and mitigation steps.
In the Linux kernel version prior to 5.1-rc5, a vulnerability exists where the page->_refcount reference count can overflow, leading to use-after-free problems, specifically affecting FUSE requests.
Understanding CVE-2019-11487
This CVE pertains to a specific vulnerability in the Linux kernel that can result in use-after-free issues under certain conditions.
What is CVE-2019-11487?
The Linux kernel before version 5.1-rc5 allows for a page->_refcount reference count overflow, potentially causing use-after-free problems when a large amount of RAM, approximately 140 GiB, is present. The vulnerability impacts various areas within the kernel code.
The Impact of CVE-2019-11487
The vulnerability can lead to use-after-free issues, potentially allowing attackers to exploit the system and execute arbitrary code.
Technical Details of CVE-2019-11487
This section provides more in-depth technical insights into the CVE.
Vulnerability Description
The vulnerability arises due to an overflow in the page->_refcount reference count, triggered by a large amount of RAM, leading to use-after-free problems.
Affected Systems and Versions
- Linux kernel versions prior to 5.1-rc5
- Specifically affects FUSE requests
Exploitation Mechanism
- Occurs when there is approximately 140 GiB of RAM
- Affected areas include fs/fuse/dev.c, fs/pipe.c, fs/splice.c, include/linux/mm.h, include/linux/pipe_fs_i.h, kernel/trace/trace.c, mm/gup.c, and mm/hugetlb.c
Mitigation and Prevention
Protecting systems from CVE-2019-11487 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply relevant security patches provided by the Linux kernel maintainers
- Monitor official sources for updates and advisories
Long-Term Security Practices
- Regularly update the Linux kernel to the latest stable version
- Implement proper access controls and restrictions to minimize the attack surface
Patching and Updates
- Stay informed about security updates from Linux distributions and apply patches promptly