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CVE-2025-21641

Description

In the Linux kernel, the following vulnerability has been resolved:mptcp: sysctl: blackhole timeout: avoid using current->nsproxyAs 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 from the opener's netns.- current->nsproxy can be NULL in some cases, resulting in an 'Oops' (null-ptr-deref), e.g. when the current task is exiting, as spotted by syzbot [1] using acct(2).The 'pernet' structure can be obtained from the table->data usingcontainer_of().

POC

Reference

No PoCs from references.

Github

- https://github.com/fkie-cad/nvd-json-data-feeds