Linux Kernel SCTP Sysctl PLPMTUD Probe Interval Vulnerability

A vulnerability in the Linux kernel's SCTP (Stream Control Transmission Protocol) implementation has been addressed. The issue arose from the sysctl parameter 'plpmtud_probe_interval', which improperly used 'current->nsproxy' to access the 'net' structure. This approach could lead to inconsistencies and potential null pointer dereferences, particularly when the current task is exiting. The vulnerability was identified by syzbot, highlighting the need for a more reliable method of obtaining network namespace information.

Impact

The vulnerability could cause a null pointer dereference, leading to a kernel crash.