In the Linux kernel, the following vulnerability has been resolved:
mptcp: sysctl: blackhole timeout: avoid using current->nsproxy
As mentioned in the previous commit, using the 'net' structure via 'current' is not recommended for different reasons:
- Inconsistency: getting info from the reader's/writer's netns vs only
- current->nsproxy can be NULL in some cases, resulting in an 'Oops'
The 'pernet' structure can be obtained from the table->data using container_of().