{"id":"CVE-2026-89950","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: mcast: linearize skbuff for packet generation\n\nbatadv_mcast_forw_packet() and batadv_mcast_forw_scrape() is not only\ncalled (indirectly) by the unsharing+li…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: mcast: linearize skbuff for packet generation\n\nbatadv_mcast_forw_packet() and batadv_mcast_forw_scrape() is not only\ncalled (indirectly) by the unsharing+li…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 90039133221e33964ccb4a536dad7eb0a372fff7 < a9603e0a7cb5e0cddc6b23af153cf7daafc5c55e","Linux >= 90039133221e33964ccb4a536dad7eb0a372fff7 < c32e5e25c41201c8c3b796a4ab2c45103187091e","Linux >= 90039133221e33964ccb4a536dad7eb0a372fff7 < 2879177539e3ece483a8e5406970373698e9a6c5","Linux >= 90039133221e33964ccb4a536dad7eb0a372fff7 < 6a30a59e2660afd03c975f1b8eae6a2301161197","Linux 6.8"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T11:17:05.160","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89950","references":[{"url":"https://git.kernel.org/stable/c/2879177539e3ece483a8e5406970373698e9a6c5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6a30a59e2660afd03c975f1b8eae6a2301161197","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a9603e0a7cb5e0cddc6b23af153cf7daafc5c55e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c32e5e25c41201c8c3b796a4ab2c45103187091e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:53.963Z","epss":0.002,"epssPercentile":0.10152,"slug":"CVE-2026-89950","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: mcast: linearize skbuff for packet generation\n\nbatadv_mcast_forw_packet() and batadv_mcast_forw_scrape() is not only\ncalled (indirectly) by the unsharing+linearizing batadv_recv_mcast_packet()\nhandler. When it is called (indirectly) by batadv_mcast_forw_mcsend() then\nit will be unshared but not linearized. The SKB_LINEAR_ASSERT() can\ntherefore cause a fatal BUG().\n\nThe linearization should happen during the expansion of the head because\nthe scrape function can be hit already during the initial\nbatadv_mcast_forw_mode() selection code:\n\n* batadv_interface_tx\n* batadv_mcast_forw_mode\n* batadv_mcast_forw_mode_by_count()\n* batadv_mcast_forw_push()\n  -> calls batadv_mcast_forw_expand_head() before everything else\n* batadv_mcast_forw_push_tvlvs()\n* batadv_mcast_forw_push_dests()\n* batadv_mcast_forw_push_adjust_padding()\n* batadv_mcast_forw_scrape()\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}