CVE-2025-21641

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 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 using container_of().

The following products are affected by CVE-2025-21641 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-21641.

URL	Resource
https://git.kernel.org/stable/c/4c74fbdc5ab95b13945be01e6065940b68222db7
https://git.kernel.org/stable/c/92cf7a51bdae24a32c592adcdd59a773ae149289
https://lore.kernel.org/linux-cve-announce/2025011944-CVE-2025-21641-0897@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2025-21641
https://www.cve.org/CVERecord?id=CVE-2025-21641