CVE-2026-98026

CVE CVE-2026-98026EUVD EUVD-2026-86679Published 2026-09-25T10:23:44.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: net: bridge: mcast: properly convert mglist to rcu Sashiko reported a bug [1] that br_multicast_del_port_group unlists the port group not using proper rcu helper that preserves the next pointer and after that immediately frees the port group without waiting for rcu grace period. The only rcu walker of mglist is br_multicast_list_adjacent() and it turns out that function has always been buggy because mglist was never properly converted to RCU. Fix it by converting it to rcu and moving its initialization after eth_addr's. Initializing p->next can use RCU_INIT_POINTER because we have a barrier from the hlist_add_head_rcu call later, besides we're initializing an unpublished structure anyway. [1] https://netdev-ai.bots.linux.dev/sashiko/#/patchset/20260826014200.362304-1-littleddfu%40gmail.com

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 07f8ac4a1e26e8283542cdaf658a6e2a12fd6980 <4b772869a1e5f9da5cef5b9c722ec0aa424ee0a0; patch: 7.2.7; patch: 6.18.53; 07f8ac4a1e26e8283542cdaf658a6e2a12fd6980 <98247c8264d2076f81fa114bdfa2c2271953ac7c; patch: 6.12.111; 07f8ac4a1e26e8283542cdaf658a6e2a12fd6980 <f7bf57e94a5d6214b87be08486cb33836fbfa573; 3.16; patch: 0; 07f8ac4a1e26e8283542cdaf658a6e2a12fd6980 <38ab2a435001a3c4dbeb70a52f5921e1ccd66f55; patch: 7.3-rc3

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Carried in the product catalogue

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Linux — Linux

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