CVE-2025-38107 (GCVE-0-2025-38107)
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: ets: fix a race in ets_qdisc_change() Gerrard Tai reported a race condition in ETS, 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: 699d82e9a6db29d509a71f1f2f4316231e6232e6
Version: ce881ddbdc028fb1988b66e40e45ca0529c23b46
Version: b05972f01e7d30419987a1f221b5593668fd6448
Version: b05972f01e7d30419987a1f221b5593668fd6448
Version: b05972f01e7d30419987a1f221b5593668fd6448
Version: b05972f01e7d30419987a1f221b5593668fd6448
Version: b05972f01e7d30419987a1f221b5593668fd6448
Version: fffa19b5e58c34004a0d6f642d9c24b11d213994
Version: fb155f6597cd7bc3aeed668c3bb15fc3b7cb257d
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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: ets: fix a race in ets_qdisc_change()\n\nGerrard Tai reported a race condition in ETS, 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": "2025-07-28T04:12:22.514Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/d92adacdd8c2960be856e0b82acc5b7c5395fddb"
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      "title": "net_sched: ets: fix a race in ets_qdisc_change()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38107",
    "datePublished": "2025-07-03T08:35:17.487Z",
    "dateReserved": "2025-04-16T04:51:23.985Z",
    "dateUpdated": "2025-07-28T04:12:22.514Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38107\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-03T09:15:24.273\",\"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: ets: fix a race in ets_qdisc_change()\\n\\nGerrard Tai reported a race condition in ETS, 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: ets: corrige una ejecuci\u00f3n en ets_qdisc_change() Gerrard Tai inform\u00f3 de una condici\u00f3n de ejecuci\u00f3n en ETS, siempre que el temporizador de perturbaci\u00f3n SFQ se dispara en el momento equivocado. La ejecuci\u00f3n 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/0383b25488a545be168744336847549d4a2d3d6c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/073f64c03516bcfaf790f8edc772e0cfb8a84ec3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0b479d0aa488cb478eb2e1d8868be946ac8afb4f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/347867cb424edae5fec1622712c8dd0a2c42918f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d92adacdd8c2960be856e0b82acc5b7c5395fddb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eb7b74e9754e1ba2088f914ad1f57a778b11894b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fed94bd51d62d2e0e006aa61480e94e5cd0582b0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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