CVE-2025-37913 (GCVE-0-2025-37913)
Vulnerability from cvelistv5
Published
2025-05-20 15:21
Modified
2025-06-04 12:57
Severity ?
Summary
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/
References
Impacted products
Vendor Product Version
Linux Linux Version: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea
Version: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea
Version: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea
Version: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea
Version: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea
Version: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea
Version: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea
Version: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea
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{
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          "programFiles": [
            "net/sched/sch_qfq.c"
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "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/"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-04T12:57:26.662Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/041f410aec2c1751ee22b8b73ba05d38c3a6a602"
        },
        {
          "url": "https://git.kernel.org/stable/c/005a479540478a820c52de098e5e767e63e36f0a"
        },
        {
          "url": "https://git.kernel.org/stable/c/0bf32d6fb1fcbf841bb9945570e0e2a70072c00f"
        },
        {
          "url": "https://git.kernel.org/stable/c/0aa23e0856b7cedb3c88d8e3d281c212c7e4fbeb"
        },
        {
          "url": "https://git.kernel.org/stable/c/a43783119e01849fbf2fe8855634e8989b240cb4"
        },
        {
          "url": "https://git.kernel.org/stable/c/53bc0b55178bd59bdd4bcd16349505cabf54b1a2"
        },
        {
          "url": "https://git.kernel.org/stable/c/370218e8ce711684acc4cdd3cc3c6dd7956bc165"
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        {
          "url": "https://git.kernel.org/stable/c/f139f37dcdf34b67f5bf92bc8e0f7f6b3ac63aa4"
        }
      ],
      "title": "net_sched: qfq: Fix double list add in class with netem as child qdisc",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37913",
    "datePublished": "2025-05-20T15:21:44.793Z",
    "dateReserved": "2025-04-16T04:51:23.967Z",
    "dateUpdated": "2025-06-04T12:57:26.662Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-37913\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-20T16:15:27.837\",\"lastModified\":\"2025-06-04T13:15:26.490\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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/\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: qfq: Se corrige la adici\u00f3n doble de lista en una clase con netem como qdisc secundaria. Como se describe en el informe de Gerrard [1], existen casos de uso en los que una qdisc secundaria netem har\u00e1 que la devoluci\u00f3n de llamada de encolado de la qdisc primaria sea reentrante. En el caso de qfq, no habr\u00e1 un UAF, pero el c\u00f3digo agregar\u00e1 el mismo clasificador a la lista dos veces, lo que causar\u00e1 corrupci\u00f3n de memoria. Este parche verifica si la clase ya se agreg\u00f3 a la lista agg-\u0026gt;active (cl_is_active) antes de realizar la adici\u00f3n para atender el caso reentrante. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/005a479540478a820c52de098e5e767e63e36f0a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/041f410aec2c1751ee22b8b73ba05d38c3a6a602\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0aa23e0856b7cedb3c88d8e3d281c212c7e4fbeb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0bf32d6fb1fcbf841bb9945570e0e2a70072c00f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/370218e8ce711684acc4cdd3cc3c6dd7956bc165\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/53bc0b55178bd59bdd4bcd16349505cabf54b1a2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a43783119e01849fbf2fe8855634e8989b240cb4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f139f37dcdf34b67f5bf92bc8e0f7f6b3ac63aa4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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