Tracker / CVE-2025-21759
CVE-2025-21759
High 7.8
In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: extend RCU protection in igmp6_send() igmp6_send() can be called without RTNL or RCU being held. Extend RCU protection so that we can safely fetch the net pointer and avoid a potential UAF. 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.
Affected products and versions
| linux | linux_kernel |
|---|---|
| linux | linux_kernel · 2.6.26 → 6.6.79 |
| linux | linux_kernel · 6.13 → 6.13.4 |
| linux | linux_kernel · 6.7 → 6.12.16 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.