CVE-2019-19815 : What You Need to Know
Learn about CVE-2019-19815, a vulnerability in Linux kernel 5.0.21 that allows attackers to trigger a NULL pointer dereference by mounting a crafted f2fs filesystem image. Find mitigation steps here.
A NULL pointer dereference vulnerability in the Linux kernel 5.0.21 can be exploited by mounting a specially crafted f2fs filesystem image. This vulnerability is associated with the function f2fs_recover_fsync_data in fs/f2fs/recovery.c.
Understanding CVE-2019-19815
This CVE involves a NULL pointer dereference issue in the Linux kernel 5.0.21 when handling f2fs filesystem images.
What is CVE-2019-19815?
This CVE refers to a vulnerability in the f2fs filesystem implementation in the Linux kernel that can be triggered by mounting a malicious f2fs filesystem image.
The Impact of CVE-2019-19815
The exploitation of this vulnerability could lead to a NULL pointer dereference, potentially resulting in a denial of service (DoS) condition.
Technical Details of CVE-2019-19815
This section provides more in-depth technical details about the vulnerability.
Vulnerability Description
The vulnerability exists in the function f2fs_recover_fsync_data in fs/f2fs/recovery.c and is related to F2FS_P_SB in fs/f2fs/f2fs.h.
Affected Systems and Versions
- Linux kernel version 5.0.21
Exploitation Mechanism
The vulnerability can be exploited by mounting a specifically crafted f2fs filesystem image in the affected Linux kernel version.
Mitigation and Prevention
Protecting systems from CVE-2019-19815 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply patches provided by the Linux kernel maintainers
- Avoid mounting untrusted or unknown filesystem images
Long-Term Security Practices
- Regularly update the Linux kernel to the latest stable version
- Implement proper filesystem image validation mechanisms
Patching and Updates
Ensure timely installation of security patches released by the Linux kernel maintainers to address this vulnerability.