{"id":"CVE-2026-89780","revision":"67a7f3c8f82c4d909fad491876fee342","records":[{"revision":"67a7f3c8f82c4d909fad491876fee342","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89780","aliases":[],"title":"net: qualcomm: rmnet: restore skb->dev on deaggregated frames","description":"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","state":0,"publishedAt":"2026-09-16T08:48:19.76+00:00","modifiedAt":"2026-10-19T08:52:32.479+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                        \"drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"378e25357ac78ad02fbc98bec9b4e3baaa916c5c\",\n                            \"lessThan\": \"5aaa7409c1b4ca4c60d66e2afa99703bf4eb7ddd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"378e25357ac78ad02fbc98bec9b4e3baaa916c5c\",\n                            \"lessThan\": \"9b78ab84ddf97c06a8567edb62b6c0fd582f9a62\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"378e25357ac78ad02fbc98bec9b4e3baaa916c5c\",\n                            \"lessThan\": \"9d18c6c6cd1666b2cb7915cad052e22abf520997\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"378e25357ac78ad02fbc98bec9b4e3baaa916c5c\",\n                            \"lessThan\": \"4bcef54e4a3355a62d9ad90729fe563435ec76c3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"378e25357ac78ad02fbc98bec9b4e3baaa916c5c\",\n                            \"lessThan\": \"b14c22c31d9e30f38ea1693ac06d318f32258f5d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"378e25357ac78ad02fbc98bec9b4e3baaa916c5c\",\n                            \"lessThan\": \"7abe769e72c792e5f9eb273813eb3ecd8389854c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"378e25357ac78ad02fbc98bec9b4e3baaa916c5c\",\n                            \"lessThan\": \"200460a0793dc6af97d3b36d92ac245350ac26fc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"378e25357ac78ad02fbc98bec9b4e3baaa916c5c\",\n                            \"lessThan\": \"a66734a1c5e36525ea07e9f4547fddc51e916de3\",\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                        \"drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.17\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.17\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\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\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\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/5aaa7409c1b4ca4c60d66e2afa99703bf4eb7ddd","https://git.kernel.org/stable/c/9b78ab84ddf97c06a8567edb62b6c0fd582f9a62","https://git.kernel.org/stable/c/9d18c6c6cd1666b2cb7915cad052e22abf520997","https://git.kernel.org/stable/c/4bcef54e4a3355a62d9ad90729fe563435ec76c3","https://git.kernel.org/stable/c/b14c22c31d9e30f38ea1693ac06d318f32258f5d","https://git.kernel.org/stable/c/7abe769e72c792e5f9eb273813eb3ecd8389854c","https://git.kernel.org/stable/c/200460a0793dc6af97d3b36d92ac245350ac26fc","https://git.kernel.org/stable/c/a66734a1c5e36525ea07e9f4547fddc51e916de3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89780","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89780","identifiers":["CVE-2026-89780"]},"retained":false,"historicalAffected":[]}],"coverage":[]}