{"id":"CVE-2026-89780","title":"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","summary":"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_i…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 378e25357ac78ad02fbc98bec9b4e3baaa916c5c < 5aaa7409c1b4ca4c60d66e2afa99703bf4eb7ddd","Linux >= 378e25357ac78ad02fbc98bec9b4e3baaa916c5c < 9b78ab84ddf97c06a8567edb62b6c0fd582f9a62","Linux >= 378e25357ac78ad02fbc98bec9b4e3baaa916c5c < 9d18c6c6cd1666b2cb7915cad052e22abf520997","Linux >= 378e25357ac78ad02fbc98bec9b4e3baaa916c5c < 4bcef54e4a3355a62d9ad90729fe563435ec76c3","Linux >= 378e25357ac78ad02fbc98bec9b4e3baaa916c5c < b14c22c31d9e30f38ea1693ac06d318f32258f5d","Linux >= 378e25357ac78ad02fbc98bec9b4e3baaa916c5c < 7abe769e72c792e5f9eb273813eb3ecd8389854c","Linux >= 378e25357ac78ad02fbc98bec9b4e3baaa916c5c < 200460a0793dc6af97d3b36d92ac245350ac26fc","Linux >= 378e25357ac78ad02fbc98bec9b4e3baaa916c5c < a66734a1c5e36525ea07e9f4547fddc51e916de3","Linux 4.17"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T09:17:08.520","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89780","references":[{"url":"https://git.kernel.org/stable/c/200460a0793dc6af97d3b36d92ac245350ac26fc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4bcef54e4a3355a62d9ad90729fe563435ec76c3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5aaa7409c1b4ca4c60d66e2afa99703bf4eb7ddd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7abe769e72c792e5f9eb273813eb3ecd8389854c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9b78ab84ddf97c06a8567edb62b6c0fd582f9a62","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9d18c6c6cd1666b2cb7915cad052e22abf520997","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a66734a1c5e36525ea07e9f4547fddc51e916de3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b14c22c31d9e30f38ea1693ac06d318f32258f5d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T08:52:29.597Z","epss":0.0021,"epssPercentile":0.11541,"slug":"CVE-2026-89780","body":"## Overview\n\nIn 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\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":[]}