VULNERABILITY INTELLIGENCE
CVE-2025-21759
CVSS score7.8 HIGH
EPSS probability7.80%
CISA KEVNot currently listed
Published2025-02-27
Last modified2026-10-03
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Description
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.
Weakness classification
- 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-416