CVE-2019-12984 : Exploit Details and Defense Strategies

An issue was found in the Linux kernel before 5.1.13, specifically in the nfc_genl_deactivate_target() function in net/nfc/netlink.c. This vulnerability can lead to a denial of service when certain NFC attributes are excluded by a user-mode program.

Understanding CVE-2019-12984

This CVE identifies a NULL pointer dereference vulnerability in the Linux kernel.

What is CVE-2019-12984?

This vulnerability in the nfc_genl_deactivate_target() function can be exploited by a malicious user-mode program that omits specific NFC attributes, resulting in a denial of service.

The Impact of CVE-2019-12984

The vulnerability can be triggered by intentionally excluding certain NFC attributes, leading to a denial of service attack.

Technical Details of CVE-2019-12984

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability is a NULL pointer dereference issue in the nfc_genl_deactivate_target() function in net/nfc/netlink.c in the Linux kernel before version 5.1.13.

Affected Systems and Versions

Affected System: Linux kernel before version 5.1.13
Affected Function: nfc_genl_deactivate_target() in net/nfc/netlink.c

Exploitation Mechanism

The vulnerability can be exploited by a user-mode program that intentionally excludes specific NFC attributes, triggering the NULL pointer dereference and leading to a denial of service.

Mitigation and Prevention

Protecting systems from CVE-2019-12984 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 related to this vulnerability.

Long-Term Security Practices

Regularly update and patch the Linux kernel to mitigate known vulnerabilities.
Implement proper access controls and monitoring to detect and prevent malicious activities.

Patching and Updates

Update to Linux kernel version 5.1.13 or newer to address the vulnerability.
Stay informed about security advisories and patches released by Linux distributions and vendors.