CVE-2025-21787

Summary

CVE-2025-21787: A vulnerability in the Linux kernel's string validation in the vsprintf function has been addressed. This issue, reported by syzbot, could lead to uninitialized values in certain strings. The flaw was identified in the team_option_set function, specifically in the team_nl_options_set_doit function, where user-provided data was not properly validated. If user-supplied data contained no null byte, it could result in uninitialized values in memory, leading to potential security vulnerabilities. The known affected functions include genl_rcv_msg, netlink_unicast_kernel, and netlink_unicast, among others. The vulnerability could be exploited through network communication using netlink protocol. The Linux kernel developers have released a patch to mitigate this issue.

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