{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "ceed73a2cf4aff2921802aa3d21d45280677547d"
            },
            {
              "fixed": "c4e676c3505c5058922dc1a6f1ded795f6758135"
            },
            {
              "fixed": "9918698cf3aee4032e12bb42fd5a951dc465339b"
            },
            {
              "fixed": "310b93246bfec7d4452507e0c15477377ed9f025"
            },
            {
              "fixed": "1078ae8175777e80c9637996fb4a46c55f0ce576"
            },
            {
              "fixed": "41e06fcc5df0774d212e70c5b503fc769492bce3"
            },
            {
              "fixed": "8b17adf6d4fb6bf61fa4c3f58366a7c082799a71"
            },
            {
              "fixed": "f193e38cb257d033060b63f1cfd94af076b3a2ab"
            },
            {
              "fixed": "d00c953a8f69921f484b629801766da68f27f658"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.14.0"
            },
            {
              "fixed": "5.10.260"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.211"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.177"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.144"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.95"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.37"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64188.json"
  },
  "details": "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 immediately frees it with kfree(). However,\nRCU readers on the receive path (rmnet_rx_handler -\u003e\n__rmnet_map_ingress_handler) may still hold a reference to the endpoint and\ndereference ep-\u003eegress_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   \u003cTASK\u003e\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   \u003c/TASK\u003e\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-\u003eegress_dev to NULL during the grace period, creating a data race\nwith lockless readers.",
  "id": "CVE-2026-64188",
  "modified": "2026-08-06T03:31:26.925794034Z",
  "published": "2026-07-20T16:27:47.216Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1078ae8175777e80c9637996fb4a46c55f0ce576"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/310b93246bfec7d4452507e0c15477377ed9f025"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41e06fcc5df0774d212e70c5b503fc769492bce3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8b17adf6d4fb6bf61fa4c3f58366a7c082799a71"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9918698cf3aee4032e12bb42fd5a951dc465339b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c4e676c3505c5058922dc1a6f1ded795f6758135"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d00c953a8f69921f484b629801766da68f27f658"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f193e38cb257d033060b63f1cfd94af076b3a2ab"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64188.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64188"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()"
}