VYPR
Medium severity5.5NVD Advisory· Published Feb 27, 2025· Updated May 12, 2026

CVE-2025-21758

CVE-2025-21758

Description

In the Linux kernel, the following vulnerability has been resolved:

ipv6: mcast: add RCU protection to mld_newpack()

mld_newpack() can be called without RTNL or RCU being held.

Note that we no longer can use sock_alloc_send_skb() because ipv6.igmp_sk uses GFP_KERNEL allocations which can sleep.

Instead use alloc_skb() and charge the net->ipv6.igmp_sk socket under RCU protection.

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Affected products

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