{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "378e25357ac78ad02fbc98bec9b4e3baaa916c5c"
            },
            {
              "fixed": "5aaa7409c1b4ca4c60d66e2afa99703bf4eb7ddd"
            },
            {
              "fixed": "9b78ab84ddf97c06a8567edb62b6c0fd582f9a62"
            },
            {
              "fixed": "9d18c6c6cd1666b2cb7915cad052e22abf520997"
            },
            {
              "fixed": "4bcef54e4a3355a62d9ad90729fe563435ec76c3"
            },
            {
              "fixed": "b14c22c31d9e30f38ea1693ac06d318f32258f5d"
            },
            {
              "fixed": "7abe769e72c792e5f9eb273813eb3ecd8389854c"
            },
            {
              "fixed": "200460a0793dc6af97d3b36d92ac245350ac26fc"
            },
            {
              "fixed": "a66734a1c5e36525ea07e9f4547fddc51e916de3"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.17.0"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89780.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qualcomm: rmnet: restore skb-\u003edev on deaggregated frames\n\nrmnet_map_deaggregate() allocates each sub-frame with alloc_skb() and\nleaves skb-\u003edev NULL. __rmnet_map_ingress_handler() assigns\nskb-\u003edev = ep-\u003eegress_dev only on the data path, but a MAP command frame\nis dispatched to rmnet_map_command() before that, so rmnet_map_send_ack()\nruns netif_tx_lock(skb-\u003edev) on a NULL device. An unprivileged user\nreaches this by unsharing a user+net namespace, creating an rmnet link\nover a tap device with INGRESS_DEAGGREGATION and INGRESS_MAP_COMMANDS,\nand writing an aggregated frame carrying a flow-control command to the\ntap fd.\n\nRestore the assignment dropped by 378e25357ac7, so every skb leaving\nrmnet_map_deaggregate() has a valid device.\n\n  BUG: KASAN: null-ptr-deref in _raw_spin_lock (kernel/locking/spinlock.c:158)\n  Write of size 4 at addr 00000000000004b4 by task exploit/144\n  Call Trace:\n   _raw_spin_lock (kernel/locking/spinlock.c:158)\n   netif_tx_lock (net/sched/sch_generic.c:497)\n   rmnet_map_command (drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c:67)\n   rmnet_rx_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:125)\n   __netif_receive_skb_core.constprop.0 (net/core/dev.c:6103)\n   ...\n   __netif_receive_skb_one_core (net/core/dev.c:6214)\n   netif_receive_skb (net/core/dev.c:6474)\n   tun_get_user (drivers/net/tun.c:1966)\n   tun_chr_write_iter (drivers/net/tun.c:2012)\n   vfs_write (fs/read_write.c:687)\n   ksys_write (fs/read_write.c:739)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n  Kernel panic - not syncing: Fatal exception in interrupt",
  "id": "CVE-2026-89780",
  "modified": "2026-09-17T03:30:30.793135336Z",
  "published": "2026-09-16T08:48:19.760Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/200460a0793dc6af97d3b36d92ac245350ac26fc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4bcef54e4a3355a62d9ad90729fe563435ec76c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5aaa7409c1b4ca4c60d66e2afa99703bf4eb7ddd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7abe769e72c792e5f9eb273813eb3ecd8389854c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b78ab84ddf97c06a8567edb62b6c0fd582f9a62"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9d18c6c6cd1666b2cb7915cad052e22abf520997"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a66734a1c5e36525ea07e9f4547fddc51e916de3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b14c22c31d9e30f38ea1693ac06d318f32258f5d"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89780.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89780"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net: qualcomm: rmnet: restore skb-\u003edev on deaggregated frames"
}