GHSA-9RCQ-4828-985W

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-19 18:32
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

media: rtl2832: fix use-after-free in rtl2832_remove()

cancel_delayed_work_sync() is called before i2c_mux_del_adapters() in rtl2832_remove(). While the cancel waits for any running instance of i2c_gate_work to finish, it does not prevent the timer from being rescheduled by a concurrent thread.

During probe, the r820t_attach() call attempts I2C transfers through the mux adapter. These transfers go through i2c_mux_master_xfer(), which calls rtl2832_deselect() after the transfer completes, rescheduling i2c_gate_work via schedule_delayed_work(). If this transfer is still in flight when rtl2832_remove() runs, rtl2832_deselect() can reschedule i2c_gate_work after it has been cancelled, causing a use-after-free when kfree(dev) is called.

Fix this by calling i2c_mux_del_adapters() before cancel_delayed_work_sync(). Once the mux adapter is unregistered, no new I2C transfers can go through it, so rtl2832_deselect() can no longer reschedule i2c_gate_work. The subsequent cancel_delayed_work_sync() is then guaranteed to be final.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68214"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:09Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: rtl2832: fix use-after-free in rtl2832_remove()\n\ncancel_delayed_work_sync() is called before i2c_mux_del_adapters()\nin rtl2832_remove(). While the cancel waits for any running instance\nof i2c_gate_work to finish, it does not prevent the timer from being\nrescheduled by a concurrent thread.\n\nDuring probe, the r820t_attach() call attempts I2C transfers through\nthe mux adapter. These transfers go through i2c_mux_master_xfer(),\nwhich calls rtl2832_deselect() after the transfer completes,\nrescheduling i2c_gate_work via schedule_delayed_work(). If this\ntransfer is still in flight when rtl2832_remove() runs,\nrtl2832_deselect() can reschedule i2c_gate_work after it has been\ncancelled, causing a use-after-free when kfree(dev) is called.\n\nFix this by calling i2c_mux_del_adapters() before\ncancel_delayed_work_sync(). Once the mux adapter is unregistered, no\nnew I2C transfers can go through it, so rtl2832_deselect() can no\nlonger reschedule i2c_gate_work. The subsequent\ncancel_delayed_work_sync() is then guaranteed to be final.",
  "id": "GHSA-9rcq-4828-985w",
  "modified": "2026-08-19T18:32:11Z",
  "published": "2026-08-10T15:33:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68214"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/13c06056699e66ff7109ba68658cc6ea4a23f516"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1e8a6bc19403661661fed5ae82f6eca6c9cdfad2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/24bef237eef8dd1ebcffb129ba21891ddad0d309"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c71bda6edc630a1f8c3c45d8df5fc22d234e042"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/680daf40a82d483949f87f0d8f98639dc47e610c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/68a9c0290897c1436ddceb8cea604c93377a0299"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/90d781711418881f8c836c2a859cc2886625d750"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9acd5bbbe1df8e487e49488692c224496d4c9e16"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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