cve-2021-47132
Vulnerability from cvelistv5
Published
2024-03-15 20:14
Modified
2024-11-04 12:00
Severity ?
Summary
mptcp: fix sk_forward_memory corruption on retransmission
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website


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                "id": "CVE-2021-47132",
                "options": [
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                    "Exploitation": "none"
                  },
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                    "Automatable": "no"
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                "role": "CISA Coordinator",
                "timestamp": "2024-03-18T15:54:25.829185Z",
                "version": "2.0.3"
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        "title": "CISA ADP Vulnrichment"
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    "cna": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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              "version": "5.13",
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix sk_forward_memory corruption on retransmission\n\nMPTCP sk_forward_memory handling is a bit special, as such field\nis protected by the msk socket spin_lock, instead of the plain\nsocket lock.\n\nCurrently we have a code path updating such field without handling\nthe relevant lock:\n\n__mptcp_retrans() -\u003e __mptcp_clean_una_wakeup()\n\nSeveral helpers in __mptcp_clean_una_wakeup() will update\nsk_forward_alloc, possibly causing such field corruption, as reported\nby Matthieu.\n\nAddress the issue providing and using a new variant of blamed function\nwhich explicitly acquires the msk spin lock."
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          "url": "https://git.kernel.org/stable/c/b5941f066b4ca331db225a976dae1d6ca8cf0ae3"
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      ],
      "title": "mptcp: fix sk_forward_memory corruption on retransmission",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47132",
    "datePublished": "2024-03-15T20:14:35.337Z",
    "dateReserved": "2024-03-04T18:12:48.840Z",
    "dateUpdated": "2024-11-04T12:00:05.791Z",
    "state": "PUBLISHED"
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  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47132\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-03-15T21:15:07.690\",\"lastModified\":\"2024-03-17T22:38:29.433\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmptcp: fix sk_forward_memory corruption on retransmission\\n\\nMPTCP sk_forward_memory handling is a bit special, as such field\\nis protected by the msk socket spin_lock, instead of the plain\\nsocket lock.\\n\\nCurrently we have a code path updating such field without handling\\nthe relevant lock:\\n\\n__mptcp_retrans() -\u003e __mptcp_clean_una_wakeup()\\n\\nSeveral helpers in __mptcp_clean_una_wakeup() will update\\nsk_forward_alloc, possibly causing such field corruption, as reported\\nby Matthieu.\\n\\nAddress the issue providing and using a new variant of blamed function\\nwhich explicitly acquires the msk spin lock.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mptcp: corrige la corrupci\u00f3n de sk_forward_memory en la retransmisi\u00f3n El manejo de MPTCP sk_forward_memory es un poco especial, ya que dicho campo est\u00e1 protegido por el socket msk spin_lock, en lugar del bloqueo de socket simple. Actualmente tenemos una ruta de c\u00f3digo que actualiza dicho campo sin manejar el bloqueo relevante: __mptcp_retrans() -\u0026gt; __mptcp_clean_una_wakeup() Varios ayudantes en __mptcp_clean_una_wakeup() actualizar\u00e1n sk_forward_alloc, posiblemente causando dicha corrupci\u00f3n de campo, seg\u00fan lo informado por Matthieu. Solucione el problema proporcionando y utilizando una nueva variante de la funci\u00f3n culpada que adquiere expl\u00edcitamente el bloqueo de giro msk.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/b5941f066b4ca331db225a976dae1d6ca8cf0ae3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b9c78b1a95966a7bd2ddae05b73eafc0cda4fba3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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