CVE-2020-36791 (GCVE-0-2020-36791)
Vulnerability from cvelistv5
Published
2025-05-07 13:17
Modified
2025-05-07 14:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net_sched: keep alloc_hash updated after hash allocation In commit 599be01ee567 ("net_sched: fix an OOB access in cls_tcindex") I moved cp->hash calculation before the first tcindex_alloc_perfect_hash(), but cp->alloc_hash is left untouched. This difference could lead to another out of bound access. cp->alloc_hash should always be the size allocated, we should update it after this tcindex_alloc_perfect_hash().
References
Impacted products
Vendor Product Version
Linux Linux Version: 73c29d2f6f8ae731b1e09051b69ed3ba2319482b
Version: b974ac51f5834a729de252fc5c1c9de9efd79b45
Version: 6cb448ee493c8a514c9afa0c346f3f5b3227de85
Version: 478c4b2ffd44e5186c7e22ae7c38a86a5b9cfde5
Version: dd8142a6fa5270783d415292ec8169f4ea2a5468
Version: 2c66ff8d08f81bcf8e8cb22e31e39c051b15336a
Version: 599be01ee567b61f4471ee8078870847d0a11e8e
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   Linux Linux Version: 4.4.214   ≤
Version: 4.9.214   ≤
Version: 4.14.171   ≤
Version: 4.19.103   ≤
Version: 5.4.19   ≤
Version: 5.5.3   ≤
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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: keep alloc_hash updated after hash allocation\n\nIn commit 599be01ee567 (\"net_sched: fix an OOB access in cls_tcindex\")\nI moved cp-\u003ehash calculation before the first\ntcindex_alloc_perfect_hash(), but cp-\u003ealloc_hash is left untouched.\nThis difference could lead to another out of bound access.\n\ncp-\u003ealloc_hash should always be the size allocated, we should\nupdate it after this tcindex_alloc_perfect_hash()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-07T14:12:46.187Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/d6cdc5bb19b595486fb2e6661e5138d73a57f454"
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          "url": "https://git.kernel.org/stable/c/c4453d2833671e3a9f6bd52f0f581056c3736386"
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          "url": "https://git.kernel.org/stable/c/557d015ffb27b672e24e6ad141fd887783871dc2"
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        {
          "url": "https://git.kernel.org/stable/c/d23faf32e577922b6da20bf3740625c1105381bf"
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        {
          "url": "https://git.kernel.org/stable/c/bd3ee8fb6371b45c71c9345cc359b94da2ddefa9"
        },
        {
          "url": "https://git.kernel.org/stable/c/0d1c3530e1bd38382edef72591b78e877e0edcd3"
        },
        {
          "url": "https://syzkaller.appspot.com/bug?id=ea260693da894e7b078d18fca2c9c0a19b457534"
        },
        {
          "url": "https://blog.cdthoughts.ch/2021/03/16/syzbot-bug.html"
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      ],
      "title": "net_sched: keep alloc_hash updated after hash allocation",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2020-36791",
    "datePublished": "2025-05-07T13:17:33.882Z",
    "dateReserved": "2024-02-26T17:07:27.435Z",
    "dateUpdated": "2025-05-07T14:12:46.187Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2020-36791\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-07T14:15:28.513\",\"lastModified\":\"2025-05-08T14:39:18.800\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet_sched: keep alloc_hash updated after hash allocation\\n\\nIn commit 599be01ee567 (\\\"net_sched: fix an OOB access in cls_tcindex\\\")\\nI moved cp-\u003ehash calculation before the first\\ntcindex_alloc_perfect_hash(), but cp-\u003ealloc_hash is left untouched.\\nThis difference could lead to another out of bound access.\\n\\ncp-\u003ealloc_hash should always be the size allocated, we should\\nupdate it after this tcindex_alloc_perfect_hash().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: mantener alloc_hash actualizado tras la asignaci\u00f3n de hash. En el commit 599be01ee567 (\\\"net_sched: corregir un acceso OOB en cls_tcindex\\\"), se movi\u00f3 el c\u00e1lculo de cp-\u0026gt;hash antes del primer tcindex_alloc_perfect_hash(), pero se mantuvo intacto. Esta diferencia podr\u00eda provocar otro acceso fuera de los l\u00edmites. cp-\u0026gt;alloc_hash siempre debe tener el tama\u00f1o asignado; debemos actualizarlo despu\u00e9s de este tcindex_alloc_perfect_hash().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://blog.cdthoughts.ch/2021/03/16/syzbot-bug.html\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0d1c3530e1bd38382edef72591b78e877e0edcd3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/557d015ffb27b672e24e6ad141fd887783871dc2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9f8b6c44be178c2498a00b270872a6e30e7c8266\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bd3ee8fb6371b45c71c9345cc359b94da2ddefa9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c4453d2833671e3a9f6bd52f0f581056c3736386\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d23faf32e577922b6da20bf3740625c1105381bf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d6cdc5bb19b595486fb2e6661e5138d73a57f454\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://syzkaller.appspot.com/bug?id=ea260693da894e7b078d18fca2c9c0a19b457534\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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