{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89780",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-89780"
  ],
  "published": "2026-09-16T08:46:47Z",
  "summary": "net: qualcomm: rmnet: restore skb->dev on deaggregated frames",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qualcomm: rmnet: restore skb->dev on deaggregated frames\n\nrmnet_map_deaggregate() allocates each sub-frame with alloc_skb() and\nleaves skb->dev NULL. __rmnet_map_ingress_handler() assigns\nskb->dev = ep->egress_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->dev) 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",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.188",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89780"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5aaa7409c1b4ca4c60d66e2afa99703bf4eb7ddd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9b78ab84ddf97c06a8567edb62b6c0fd582f9a62"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9d18c6c6cd1666b2cb7915cad052e22abf520997"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4bcef54e4a3355a62d9ad90729fe563435ec76c3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b14c22c31d9e30f38ea1693ac06d318f32258f5d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7abe769e72c792e5f9eb273813eb3ecd8389854c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/200460a0793dc6af97d3b36d92ac245350ac26fc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a66734a1c5e36525ea07e9f4547fddc51e916de3"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-16T08:46:47Z"
  }
}