CVE-2025-38193 (GCVE-0-2025-38193)
Vulnerability from cvelistv5
Published
2025-07-04 13:37
Modified
2025-07-28 04:14
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: reject invalid perturb period Gerrard Tai reported that SFQ perturb_period has no range check yet, and this can be used to trigger a race condition fixed in a separate patch. We want to make sure ctl->perturb_period * HZ will not overflow and is positive. tc qd add dev lo root sfq perturb -10 # negative value : error Error: sch_sfq: invalid perturb period. tc qd add dev lo root sfq perturb 1000000000 # too big : error Error: sch_sfq: invalid perturb period. tc qd add dev lo root sfq perturb 2000000 # acceptable value tc -s -d qd sh dev lo qdisc sfq 8005: root refcnt 2 limit 127p quantum 64Kb depth 127 flows 128 divisor 1024 perturb 2000000sec Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
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          "product": "Linux",
          "programFiles": [
            "net/sched/sch_sfq.c"
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: sch_sfq: reject invalid perturb period\n\nGerrard Tai reported that SFQ perturb_period has no range check yet,\nand this can be used to trigger a race condition fixed in a separate patch.\n\nWe want to make sure ctl-\u003eperturb_period * HZ will not overflow\nand is positive.\n\n\ntc qd add dev lo root sfq perturb -10   # negative value : error\nError: sch_sfq: invalid perturb period.\n\ntc qd add dev lo root sfq perturb 1000000000 # too big : error\nError: sch_sfq: invalid perturb period.\n\ntc qd add dev lo root sfq perturb 2000000 # acceptable value\ntc -s -d qd sh dev lo\nqdisc sfq 8005: root refcnt 2 limit 127p quantum 64Kb depth 127 flows 128 divisor 1024 perturb 2000000sec\n Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)\n backlog 0b 0p requeues 0"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:14:40.782Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2254d038dab9c194fe6a4b1ce31034f42e91a6e5"
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        {
          "url": "https://git.kernel.org/stable/c/956b5aebb349449b38d920d444ca1392d43719d1"
        },
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          "url": "https://git.kernel.org/stable/c/b11a50544af691b787384089b68f740ae20a441b"
        },
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          "url": "https://git.kernel.org/stable/c/0357da9149eac621f39e235a135ebf155f01f7c3"
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          "url": "https://git.kernel.org/stable/c/f9b97d466e6026ccbdda30bb5b71965b67ccbc82"
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        {
          "url": "https://git.kernel.org/stable/c/590b2d7d0beadba2aa576708a05a05f0aae39295"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ca52541c05c832d32b112274f81a985101f9ba8"
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      "title": "net_sched: sch_sfq: reject invalid perturb period",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38193",
    "datePublished": "2025-07-04T13:37:17.285Z",
    "dateReserved": "2025-04-16T04:51:23.993Z",
    "dateUpdated": "2025-07-28T04:14:40.782Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38193\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-04T14:15:26.403\",\"lastModified\":\"2025-07-17T17:15:37.127\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet_sched: sch_sfq: reject invalid perturb period\\n\\nGerrard Tai reported that SFQ perturb_period has no range check yet,\\nand this can be used to trigger a race condition fixed in a separate patch.\\n\\nWe want to make sure ctl-\u003eperturb_period * HZ will not overflow\\nand is positive.\\n\\n\\ntc qd add dev lo root sfq perturb -10   # negative value : error\\nError: sch_sfq: invalid perturb period.\\n\\ntc qd add dev lo root sfq perturb 1000000000 # too big : error\\nError: sch_sfq: invalid perturb period.\\n\\ntc qd add dev lo root sfq perturb 2000000 # acceptable value\\ntc -s -d qd sh dev lo\\nqdisc sfq 8005: root refcnt 2 limit 127p quantum 64Kb depth 127 flows 128 divisor 1024 perturb 2000000sec\\n Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)\\n backlog 0b 0p requeues 0\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: sch_sfq: rechaza un per\u00edodo de perturbaci\u00f3n no v\u00e1lido. Gerrard Tai inform\u00f3 que SFQ perturb_period a\u00fan no tiene comprobaci\u00f3n de rango, lo que puede usarse para activar una condici\u00f3n de ejecuci\u00f3n corregida en un parche independiente. Queremos asegurarnos de que ctl-\u0026gt;perturb_period * HZ no se desborde y sea positivo. tc qd add dev lo root sfq perturb -10 # valor negativo: error. Error: sch_sfq: per\u00edodo de perturbaci\u00f3n no v\u00e1lido. tc qd add dev lo root sfq perturb 100000000 # demasiado grande: error. Error: sch_sfq: per\u00edodo de perturbaci\u00f3n no v\u00e1lido. tc qd add dev lo root sfq perturb 2000000 # valor aceptable tc -s -d qd sh dev lo qdisc sfq 8005: root refcnt 2 limit 127p quantum 64Kb Depth 127 flows 128 divisor 1024 perturb 2000000sec Enviados 0 bytes 0 paquete (eliminados 0, sobrepasa los l\u00edmites 0, vuelve a poner en cola 0) backlog 0b 0p vuelve a poner en cola 0\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0357da9149eac621f39e235a135ebf155f01f7c3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2254d038dab9c194fe6a4b1ce31034f42e91a6e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/590b2d7d0beadba2aa576708a05a05f0aae39295\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7ca52541c05c832d32b112274f81a985101f9ba8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/956b5aebb349449b38d920d444ca1392d43719d1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b11a50544af691b787384089b68f740ae20a441b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f9b97d466e6026ccbdda30bb5b71965b67ccbc82\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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