{"id":"CVE-2026-89950","revision":"304558a00fdb4a07a0b662b30ce65898","records":[{"revision":"304558a00fdb4a07a0b662b30ce65898","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89950","aliases":[],"title":"batman-adv: mcast: linearize skbuff for packet generation","description":"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+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()","state":0,"publishedAt":"2026-09-16T10:32:35.485+00:00","modifiedAt":"2026-10-19T08:55:24.361+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/batman-adv/multicast_forw.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"90039133221e33964ccb4a536dad7eb0a372fff7\",\n                            \"lessThan\": \"a9603e0a7cb5e0cddc6b23af153cf7daafc5c55e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"90039133221e33964ccb4a536dad7eb0a372fff7\",\n                            \"lessThan\": \"c32e5e25c41201c8c3b796a4ab2c45103187091e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"90039133221e33964ccb4a536dad7eb0a372fff7\",\n                            \"lessThan\": \"2879177539e3ece483a8e5406970373698e9a6c5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"90039133221e33964ccb4a536dad7eb0a372fff7\",\n                            \"lessThan\": \"6a30a59e2660afd03c975f1b8eae6a2301161197\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/batman-adv/multicast_forw.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.8\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.51\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.5\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/a9603e0a7cb5e0cddc6b23af153cf7daafc5c55e","https://git.kernel.org/stable/c/c32e5e25c41201c8c3b796a4ab2c45103187091e","https://git.kernel.org/stable/c/2879177539e3ece483a8e5406970373698e9a6c5","https://git.kernel.org/stable/c/6a30a59e2660afd03c975f1b8eae6a2301161197"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89950","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89950","identifiers":["CVE-2026-89950"]},"retained":false,"historicalAffected":[]}],"coverage":[]}