Linux Kernel NULL Pointer Dereference Vulnerability in DSA Switch Shutdown

A vulnerability in the Linux kernel's handling of DSA (Distributed Switch Architecture) switches can lead to a NULL pointer dereference during the shutdown process. This issue arises when multiple switches are probed simultaneously, causing all but the last switch to exit early without fully initializing. As a result, the driver's shutdown method may attempt to access uninitialized data structures, leading to a panic. The vulnerability has been addressed by adding a check to ensure that the switch being shut down has been properly initialized.

Impact

Exploitation of this vulnerability causes a kernel panic due to a NULL pointer dereference, disrupting system operations.