{"id":"CVE-2026-64188","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()\n\nrmnet_dellink() removes the endpoint from the hash table with\nhlist_del_init_rcu() and then immedi…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()\n\nrmnet_dellink() removes the endpoint from the hash table with\nhlist_del_init_rcu() and then immedi…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","published":"2026-07-20","updated":"2026-07-27","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-64188","references":[{"url":"https://git.kernel.org/stable/c/1078ae8175777e80c9637996fb4a46c55f0ce576","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/310b93246bfec7d4452507e0c15477377ed9f025","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/41e06fcc5df0774d212e70c5b503fc769492bce3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8b17adf6d4fb6bf61fa4c3f58366a7c082799a71","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9918698cf3aee4032e12bb42fd5a951dc465339b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c4e676c3505c5058922dc1a6f1ded795f6758135","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d00c953a8f69921f484b629801766da68f27f658","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f193e38cb257d033060b63f1cfd94af076b3a2ab","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00117,"epssPercentile":0.01914,"ingestedAt":"2026-07-27T06:16:48.808Z","slug":"CVE-2026-64188","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()\n\nrmnet_dellink() removes the endpoint from the hash table with\nhlist_del_init_rcu() and then immediately frees it with kfree(). However,\nRCU readers on the receive path (rmnet_rx_handler ->\n__rmnet_map_ingress_handler) may still hold a reference to the endpoint and\ndereference ep->egress_dev after the memory has been freed. The endpoint is\na kmalloc-32 object, and the stale read at offset 8 corresponds to the\negress_dev pointer.\n\n  BUG: unable to handle page fault for address: ffffffffde942eef\n  Oops: 0002 [#1] SMP NOPTI\n  CPU: 1 UID: 0 PID: 137 Comm: poc_write Not tainted 7.0.0+ #4 PREEMPTLAZY\n  RIP: 0010:rmnet_vnd_rx_fixup (rmnet_vnd.c:27)\n  Call Trace:\n   <TASK>\n   __rmnet_map_ingress_handler (rmnet_handlers.c:48 rmnet_handlers.c:101)\n   rmnet_rx_handler (rmnet_handlers.c:129 rmnet_handlers.c:235)\n   __netif_receive_skb_core.constprop.0 (net/core/dev.c:6096)\n   __netif_receive_skb_one_core (net/core/dev.c:6208)\n   netif_receive_skb (net/core/dev.c:6467)\n   tun_get_user (drivers/net/tun.c:1955)\n   tun_chr_write_iter (drivers/net/tun.c:2003)\n   vfs_write (fs/read_write.c:688)\n   ksys_write (fs/read_write.c:740)\n   </TASK>\n\nAdd an rcu_head field to struct rmnet_endpoint and replace kfree() with\nkfree_rcu() so the endpoint memory remains valid through the RCU grace\nperiod. Also remove the rmnet_vnd_dellink() call and inline only the\nnr_rmnet_devs decrement, since rmnet_vnd_dellink() would set\nep->egress_dev to NULL during the grace period, creating a data race\nwith lockless readers.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}