nvd-json-data-feeds/CVE-2024/CVE-2024-422xx/CVE-2024-42271.json

{
  "id": "CVE-2024-42271",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-08-17T09:15:08.307",
  "lastModified": "2024-08-19T20:03:31.840",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/iucv: fix use after free in iucv_sock_close()\n\niucv_sever_path() is called from process context and from bh context.\niucv->path is used as indicator whether somebody else is taking care of\nsevering the path (or it is already removed / never existed).\nThis needs to be done with atomic compare and swap, otherwise there is a\nsmall window where iucv_sock_close() will try to work with a path that has\nalready been severed and freed by iucv_callback_connrej() called by\niucv_tasklet_fn().\n\nExample:\n[452744.123844] Call Trace:\n[452744.123845] ([<0000001e87f03880>] 0x1e87f03880)\n[452744.123966]  [<00000000d593001e>] iucv_path_sever+0x96/0x138\n[452744.124330]  [<000003ff801ddbca>] iucv_sever_path+0xc2/0xd0 [af_iucv]\n[452744.124336]  [<000003ff801e01b6>] iucv_sock_close+0xa6/0x310 [af_iucv]\n[452744.124341]  [<000003ff801e08cc>] iucv_sock_release+0x3c/0xd0 [af_iucv]\n[452744.124345]  [<00000000d574794e>] __sock_release+0x5e/0xe8\n[452744.124815]  [<00000000d5747a0c>] sock_close+0x34/0x48\n[452744.124820]  [<00000000d5421642>] __fput+0xba/0x268\n[452744.124826]  [<00000000d51b382c>] task_work_run+0xbc/0xf0\n[452744.124832]  [<00000000d5145710>] do_notify_resume+0x88/0x90\n[452744.124841]  [<00000000d5978096>] system_call+0xe2/0x2c8\n[452744.125319] Last Breaking-Event-Address:\n[452744.125321]  [<00000000d5930018>] iucv_path_sever+0x90/0x138\n[452744.125324]\n[452744.125325] Kernel panic - not syncing: Fatal exception in interrupt\n\nNote that bh_lock_sock() is not serializing the tasklet context against\nprocess context, because the check for sock_owned_by_user() and\ncorresponding handling is missing.\n\nIdeas for a future clean-up patch:\nA) Correct usage of bh_lock_sock() in tasklet context, as described in\nRe-enqueue, if needed. This may require adding return values to the\ntasklet functions and thus changes to all users of iucv.\n\nB) Change iucv tasklet into worker and use only lock_sock() in af_iucv."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/iucv: corrige el use after free en iucv_sock_close() iucv_sever_path() se llama desde el contexto del proceso y desde el contexto bh. iucv-&gt;path se utiliza como indicador de si alguien m\u00e1s se est\u00e1 encargando de cortar la ruta (o si ya se elimin\u00f3 o nunca existi\u00f3). Esto debe hacerse con comparaci\u00f3n e intercambio at\u00f3mico; de lo contrario, hay una peque\u00f1a ventana donde iucv_sock_close() intentar\u00e1 trabajar con una ruta que ya ha sido cortada y liberada por iucv_callback_connrej() llamada por iucv_tasklet_fn(). Ejemplo: [452744.123844] Seguimiento de llamadas: [452744.123845] ([&lt;0000001e87f03880&gt;] 0x1e87f03880) [452744.123966] [&lt;00000000d593001e&gt;] iucv_path_sever+0x96/0x13 8 [452744.124330] [&lt;000003ff801ddbca&gt;] iucv_sever_path+0xc2/0xd0 [af_iucv] [452744.124336 ] [&lt;000003ff801e01b6&gt;] iucv_sock_close+0xa6/0x310 [af_iucv] [452744.124341] [&lt;000003ff801e08cc&gt;] iucv_sock_release+0x3c/0xd0 [af_iucv] [452744.124345] 000000d574794e&gt;] __sock_release+0x5e/0xe8 [452744.124815] [&lt;00000000d5747a0c&gt; ] sock_close+0x34/0x48 [452744.124820] [&lt;00000000d5421642&gt;] __fput+0xba/0x268 [452744.124826] [&lt;00000000d51b382c&gt;] task_work_run+0xbc/0xf0 [452744.1 24832] [&lt;00000000d5145710&gt;] do_notify_resume+0x88/0x90 [452744.124841] [&lt; 00000000d5978096&gt;] system_call+0xe2/0x2c8 [452744.125319] \u00daltima direcci\u00f3n del evento de \u00faltima hora: [452744.125321] [&lt;00000000d5930018&gt;] iucv_path_sever+0x90/0x138 [452744.125 324] [452744.125325] P\u00e1nico del kernel: no se sincroniza: excepci\u00f3n fatal en la interrupci\u00f3n. Tenga en cuenta que bh_lock_sock () no serializa el contexto del tasklet con respecto al contexto del proceso, porque falta la verificaci\u00f3n de sock_owned_by_user() y el manejo correspondiente. Ideas para un futuro parche de limpieza: A) Uso correcto de bh_lock_sock() en el contexto del tasklet, como se describe en Volver a poner en cola, si es necesario. Esto puede requerir agregar valores de retorno a las funciones del tasklet y, por lo tanto, cambios para todos los usuarios de iucv. B) Cambie el tasklet iucv a trabajador y use solo lock_sock() en af_iucv."
    }
  ],
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      {
        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
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  "weaknesses": [
    {
      "source": "nvd@nist.gov",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
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