CVE-2025-21759

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A potential issue in the Linux kernel has been identified, related to the igmp6 send() function. This function can be called without the necessary synchronization, potentially leading to a use-after-free (UAF) condition. To address this, RCU protection has been extended to ensure safe access to the net pointer. Additionally, the allocation method for sending skb has been changed from sock alloc send skb() to alloc skb() due to the use of GFP KERNEL allocations, which can sleep.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.