CVE-2025-38108 (GCVE-0-2025-38108)
Vulnerability from cvelistv5
Published
2025-07-03 08:35
Modified
2025-07-28 04:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net_sched: red: fix a race in __red_change() Gerrard Tai reported a race condition in RED, whenever SFQ perturb timer fires at the wrong time. The race is as follows: CPU 0 CPU 1 [1]: lock root [2]: qdisc_tree_flush_backlog() [3]: unlock root | | [5]: lock root | [6]: rehash | [7]: qdisc_tree_reduce_backlog() | [4]: qdisc_put() This can be abused to underflow a parent's qlen. Calling qdisc_purge_queue() instead of qdisc_tree_flush_backlog() should fix the race, because all packets will be purged from the qdisc before releasing the lock.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0c8d13ac96070000da33f394f45e9c19638483c5
Version: 0c8d13ac96070000da33f394f45e9c19638483c5
Version: 0c8d13ac96070000da33f394f45e9c19638483c5
Version: 0c8d13ac96070000da33f394f45e9c19638483c5
Version: 0c8d13ac96070000da33f394f45e9c19638483c5
Version: 0c8d13ac96070000da33f394f45e9c19638483c5
Version: 0c8d13ac96070000da33f394f45e9c19638483c5
Version: 0c8d13ac96070000da33f394f45e9c19638483c5
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{
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          "programFiles": [
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: red: fix a race in __red_change()\n\nGerrard Tai reported a race condition in RED, whenever SFQ perturb timer\nfires at the wrong time.\n\nThe race is as follows:\n\nCPU 0                                 CPU 1\n[1]: lock root\n[2]: qdisc_tree_flush_backlog()\n[3]: unlock root\n |\n |                                    [5]: lock root\n |                                    [6]: rehash\n |                                    [7]: qdisc_tree_reduce_backlog()\n |\n[4]: qdisc_put()\n\nThis can be abused to underflow a parent\u0027s qlen.\n\nCalling qdisc_purge_queue() instead of qdisc_tree_flush_backlog()\nshould fix the race, because all packets will be purged from the qdisc\nbefore releasing the lock."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:12:23.828Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/a1bf6a4e9264a685b0e642994031f9c5aad72414"
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          "url": "https://git.kernel.org/stable/c/110a47efcf23438ff8d31dbd9c854fae2a48bf98"
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        {
          "url": "https://git.kernel.org/stable/c/85a3e0ede38450ea3053b8c45d28cf55208409b8"
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      "title": "net_sched: red: fix a race in __red_change()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38108",
    "datePublished": "2025-07-03T08:35:18.523Z",
    "dateReserved": "2025-04-16T04:51:23.985Z",
    "dateUpdated": "2025-07-28T04:12:23.828Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38108\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-03T09:15:24.413\",\"lastModified\":\"2025-07-03T15:13:53.147\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet_sched: red: fix a race in __red_change()\\n\\nGerrard Tai reported a race condition in RED, whenever SFQ perturb timer\\nfires at the wrong time.\\n\\nThe race is as follows:\\n\\nCPU 0                                 CPU 1\\n[1]: lock root\\n[2]: qdisc_tree_flush_backlog()\\n[3]: unlock root\\n |\\n |                                    [5]: lock root\\n |                                    [6]: rehash\\n |                                    [7]: qdisc_tree_reduce_backlog()\\n |\\n[4]: qdisc_put()\\n\\nThis can be abused to underflow a parent\u0027s qlen.\\n\\nCalling qdisc_purge_queue() instead of qdisc_tree_flush_backlog()\\nshould fix the race, because all packets will be purged from the qdisc\\nbefore releasing the lock.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: red: corrige una ejecuci\u00f3n en __red_change() Gerrard Tai inform\u00f3 una condici\u00f3n de ejecuci\u00f3n en RED, siempre que el temporizador de perturbaci\u00f3n SFQ se dispara en el momento equivocado. La carrera es la siguiente: CPU 0 CPU 1 [1]: ra\u00edz de bloqueo [2]: qdisc_tree_flush_backlog() [3]: ra\u00edz de desbloqueo | | [5]: ra\u00edz de bloqueo | [6]: rehash | [7]: qdisc_tree_reduce_backlog() | [4]: qdisc_put() Esto se puede abusar para desbordar el qlen de un padre. Llamar a qdisc_purge_queue() en lugar de qdisc_tree_flush_backlog() deber\u00eda corregir la ejecuci\u00f3n, porque todos los paquetes se purgar\u00e1n del qdisc antes de liberar el bloqueo.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/110a47efcf23438ff8d31dbd9c854fae2a48bf98\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2790c4ec481be45a80948d059cd7c9a06bc37493\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2a71924ca4af59ffc00f0444732b6cd54b153d0e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/444ad445df5496a785705019268a8a84b84484bb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4b755305b2b0618e857fdadb499365b5f2e478d1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/85a3e0ede38450ea3053b8c45d28cf55208409b8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a1bf6a4e9264a685b0e642994031f9c5aad72414\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f569984417a4e12c67366e69bdcb752970de921d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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