ghsa-5363-pqw5-qgr2
Vulnerability from github
Published
2025-05-20 18:30
Modified
2025-11-03 21:33
Details

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

net_sched: qfq: 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 qfq, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption.

This patch checks whether the class was already added to the agg->active list (cl_is_active) before doing the addition to cater 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-2025-37913"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-20T16:15:27Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: qfq: 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 qfq, there won\u0027t be a UAF, but the code will add the same\nclassifier to the list twice, which will cause memory corruption.\n\nThis patch checks whether the class was already added to the agg-\u003eactive\nlist (cl_is_active) before doing the addition to cater for the reentrant\ncase.\n\n[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/",
  "id": "GHSA-5363-pqw5-qgr2",
  "modified": "2025-11-03T21:33:54Z",
  "published": "2025-05-20T18:30:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-37913"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/005a479540478a820c52de098e5e767e63e36f0a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/041f410aec2c1751ee22b8b73ba05d38c3a6a602"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0aa23e0856b7cedb3c88d8e3d281c212c7e4fbeb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0bf32d6fb1fcbf841bb9945570e0e2a70072c00f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/370218e8ce711684acc4cdd3cc3c6dd7956bc165"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/53bc0b55178bd59bdd4bcd16349505cabf54b1a2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a43783119e01849fbf2fe8855634e8989b240cb4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f139f37dcdf34b67f5bf92bc8e0f7f6b3ac63aa4"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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