CVE-2026-89950

CVE CVE-2026-89950EUVD EUVD-2026-80550Published 2026-09-16T10:32:35.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: batman-adv: mcast: linearize skbuff for packet generation batadv_mcast_forw_packet() and batadv_mcast_forw_scrape() is not only called (indirectly) by the unsharing+linearizing batadv_recv_mcast_packet() handler. When it is called (indirectly) by batadv_mcast_forw_mcsend() then it will be unshared but not linearized. The SKB_LINEAR_ASSERT() can therefore cause a fatal BUG(). The linearization should happen during the expansion of the head because the scrape function can be hit already during the initial batadv_mcast_forw_mode() selection code: * batadv_interface_tx * batadv_mcast_forw_mode * batadv_mcast_forw_mode_by_count() * batadv_mcast_forw_push() -> calls batadv_mcast_forw_expand_head() before everything else * batadv_mcast_forw_push_tvlvs() * batadv_mcast_forw_push_dests() * batadv_mcast_forw_push_adjust_padding() * batadv_mcast_forw_scrape()

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 90039133221e33964ccb4a536dad7eb0a372fff7 <a9603e0a7cb5e0cddc6b23af153cf7daafc5c55e; patch: 7.2.5; 90039133221e33964ccb4a536dad7eb0a372fff7 <c32e5e25c41201c8c3b796a4ab2c45103187091e; 90039133221e33964ccb4a536dad7eb0a372fff7 <6a30a59e2660afd03c975f1b8eae6a2301161197; patch: 0; 6.8; patch: 7.3-rc1; patch: 6.12.110; 90039133221e33964ccb4a536dad7eb0a372fff7 <2879177539e3ece483a8e5406970373698e9a6c5; patch: 6.18.51

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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