ghsa-5pxm-fr3g-jf32
Vulnerability from github
Published
2025-05-07 15:31
Modified
2025-05-07 15:31
Details

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().

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{
  "affected": [],
  "aliases": [
    "CVE-2020-36791"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-07T14:15:28Z",
    "severity": null
  },
  "details": "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().",
  "id": "GHSA-5pxm-fr3g-jf32",
  "modified": "2025-05-07T15:31:41Z",
  "published": "2025-05-07T15:31:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-36791"
    },
    {
      "type": "WEB",
      "url": "https://blog.cdthoughts.ch/2021/03/16/syzbot-bug.html"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d1c3530e1bd38382edef72591b78e877e0edcd3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/557d015ffb27b672e24e6ad141fd887783871dc2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9f8b6c44be178c2498a00b270872a6e30e7c8266"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bd3ee8fb6371b45c71c9345cc359b94da2ddefa9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c4453d2833671e3a9f6bd52f0f581056c3736386"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d23faf32e577922b6da20bf3740625c1105381bf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d6cdc5bb19b595486fb2e6661e5138d73a57f454"
    },
    {
      "type": "WEB",
      "url": "https://syzkaller.appspot.com/bug?id=ea260693da894e7b078d18fca2c9c0a19b457534"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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