ghsa-65r3-2h9p-mm4c
Vulnerability from github
Published
2025-03-14 00:30
Modified
2025-03-14 00:30
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

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

drivers: staging: rtl8192e: Fix deadlock in rtllib_beacons_stop()

There is a deadlock in rtllib_beacons_stop(), which is shown below:

(Thread 1) | (Thread 2) | rtllib_send_beacon() rtllib_beacons_stop() | mod_timer() spin_lock_irqsave() //(1) | (wait a time) ... | rtllib_send_beacon_cb() del_timer_sync() | spin_lock_irqsave() //(2) (wait timer to stop) | ...

We hold ieee->beacon_lock in position (1) of thread 1 and use del_timer_sync() to wait timer to stop, but timer handler also need ieee->beacon_lock in position (2) of thread 2. As a result, rtllib_beacons_stop() will block forever.

This patch extracts del_timer_sync() from the protection of spin_lock_irqsave(), which could let timer handler to obtain the needed lock.

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49315"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:08Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrivers: staging: rtl8192e: Fix deadlock in rtllib_beacons_stop()\n\nThere is a deadlock in rtllib_beacons_stop(), which is shown\nbelow:\n\n   (Thread 1)              |      (Thread 2)\n                           | rtllib_send_beacon()\nrtllib_beacons_stop()      |  mod_timer()\n spin_lock_irqsave() //(1) |  (wait a time)\n ...                       | rtllib_send_beacon_cb()\n del_timer_sync()          |  spin_lock_irqsave() //(2)\n (wait timer to stop)      |  ...\n\nWe hold ieee-\u003ebeacon_lock in position (1) of thread 1 and\nuse del_timer_sync() to wait timer to stop, but timer handler\nalso need ieee-\u003ebeacon_lock in position (2) of thread 2.\nAs a result, rtllib_beacons_stop() will block forever.\n\nThis patch extracts del_timer_sync() from the protection of\nspin_lock_irqsave(), which could let timer handler to obtain\nthe needed lock.",
  "id": "GHSA-65r3-2h9p-mm4c",
  "modified": "2025-03-14T00:30:51Z",
  "published": "2025-03-14T00:30:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49315"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/08bacf871c019163ccd1389d0bc957a43324967a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f69d7d5e918aa43423d86bd17ddb11b1b5e8ada"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/381045dc64d23a2229c47c5524c06bfc33d34446"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4681129fda9e8555392eaaadb239ec6a6e2b3e12"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/46c861009bf437a18417df24cea0d181741b7d72"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/64b05fa212c7e4d057676e8b7e7120c6eb2f615b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b6bdbd9337de3917945847bde262a34a87a6303"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fef451f0fbbe85dbd2962b18379d02e2965610db"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ffd4c4d5293e4985092ea45ba21cad9326e2e434"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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