{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "90039133221e33964ccb4a536dad7eb0a372fff7"
            },
            {
              "fixed": "a9603e0a7cb5e0cddc6b23af153cf7daafc5c55e"
            },
            {
              "fixed": "c32e5e25c41201c8c3b796a4ab2c45103187091e"
            },
            {
              "fixed": "2879177539e3ece483a8e5406970373698e9a6c5"
            },
            {
              "fixed": "6a30a59e2660afd03c975f1b8eae6a2301161197"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.8.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.51"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89950.json"
  },
  "details": "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  -\u003e 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()",
  "id": "CVE-2026-89950",
  "modified": "2026-09-18T03:31:02.261645435Z",
  "published": "2026-09-16T10:32:35.485Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2879177539e3ece483a8e5406970373698e9a6c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6a30a59e2660afd03c975f1b8eae6a2301161197"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a9603e0a7cb5e0cddc6b23af153cf7daafc5c55e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c32e5e25c41201c8c3b796a4ab2c45103187091e"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89950.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89950"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "batman-adv: mcast: linearize skbuff for packet generation"
}