Linux Kernel nfc_genl_deactivate_target() Function NULL Pointer Dereference DoS Vulnerability [CVE-2019-12984]

CVE Number – CVE-2019-12984

• A vulnerability in the nfc_genl_deactivate_target() function of the Linux Kernel could allow an unauthenticated, local attacker to cause a denial of service (DoS) condition on a targeted system.
  
  The vulnerability is due to a NULL pointer dereference condition that exists in the nfc_genl_deactivate_target() function, as defined in the net/nfc/netlink.c source code file of the affected software. An attacker could exploit the vulnerability by persuading a user to execute an application that omits certain near-field communication (NFC) attributes. A successful exploit could result in a DoS condition on the targeted system. 
  
  Kernel.org has confirmed the vulnerability and released software updates.

Analysis

• To exploit this vulnerability, the attacker must persuade a user to execute an application that omits NFC attributes on the targeted system. This requirement could reduce the likelihood of a successful exploit.

Safeguards

• Administrators are advised to apply the appropriate updates.
  
  Administrators are advised to allow only trusted users to access local systems.Administrators are advised to allow only privileged users to access administration or management systems.
  
  Administrators are advised to monitor critical systems.

Vendor Announcements

• Kernel.org has released a changelog at the following link: Kernel ChangeLog-5.1.13

Fixed Software

• Kernel.org has released software updates and a git commit at the following links: Kernel 5.1.13 and nfc: Ensure presence of required attributes in the deactivate_target handler