ghsa-j8pj-vhjm-p7g6
Vulnerability from github
Published
2025-05-20 18:30
Modified
2025-06-04 15:30
Details

In the Linux kernel, the following vulnerability has been resolved:

net_sched: drr: Fix double list add in class with netem as child qdisc

As described in Gerrard's report [1], there are use cases where a netem child qdisc will make the parent qdisc's enqueue callback reentrant. In the case of drr, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption.

In addition to checking for qlen being zero, this patch checks whether the class was already added to the active_list (cl_is_active) before adding to the list to cover for the reentrant case.

[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/

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{
  "affected": [],
  "aliases": [
    "CVE-2025-37915"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-20T16:15:28Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: drr: Fix double list add in class with netem as child qdisc\n\nAs described in Gerrard\u0027s report [1], there are use cases where a netem\nchild qdisc will make the parent qdisc\u0027s enqueue callback reentrant.\nIn the case of drr, there won\u0027t be a UAF, but the code will add the same\nclassifier to the list twice, which will cause memory corruption.\n\nIn addition to checking for qlen being zero, this patch checks whether the\nclass was already added to the active_list (cl_is_active) before adding\nto the list to cover for the reentrant case.\n\n[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/",
  "id": "GHSA-j8pj-vhjm-p7g6",
  "modified": "2025-06-04T15:30:27Z",
  "published": "2025-05-20T18:30:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-37915"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/26e75716b94d6ff9be5ea07d63675c4d189f30b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2968632880f1792007eedd12eeedf7f6e2b7e9f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b07ac06b0a712923255aaf2691637693fc7100d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f0ecf50cdf76da95828578a92f130b653ac2fcf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5da3aad1a13e7edb8ff0778a444ccf49930313e9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab2248110738d4429668140ad22f530a9ee730e1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db205b92dfe0501e5b92fb7cf00971d0e44ba3eb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f99a3fbf023e20b626be4b0f042463d598050c9a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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