CVE-2025-21759High· 7.8▾ TwilightIn 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 ne…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 1.6 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
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.
linux_kernel >= 2.6.26, < 6.6.79linux_kernel >= 6.7, < 6.12.16linux_kernel >= 6.13, < 6.13.4linux_kernel = 6.14Upgrade past the affected range:
linux_kernel 6.13.4Connected by shared product, vendor, weakness, or advisory.
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