fkie_cve-2024-40900
Vulnerability from fkie_nvd
Published
2024-07-12 13:15
Modified
2024-11-21 09:31
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: cachefiles: remove requests from xarray during flushing requests Even with CACHEFILES_DEAD set, we can still read the requests, so in the following concurrency the request may be used after it has been freed: mount | daemon_thread1 | daemon_thread2 ------------------------------------------------------------ cachefiles_ondemand_init_object cachefiles_ondemand_send_req REQ_A = kzalloc(sizeof(*req) + data_len) wait_for_completion(&REQ_A->done) cachefiles_daemon_read cachefiles_ondemand_daemon_read // close dev fd cachefiles_flush_reqs complete(&REQ_A->done) kfree(REQ_A) xa_lock(&cache->reqs); cachefiles_ondemand_select_req req->msg.opcode != CACHEFILES_OP_READ // req use-after-free !!! xa_unlock(&cache->reqs); xa_destroy(&cache->reqs) Hence remove requests from cache->reqs when flushing them to avoid accessing freed requests.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7
Impacted products
Vendor Product Version


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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncachefiles: remove requests from xarray during flushing requests\n\nEven with CACHEFILES_DEAD set, we can still read the requests, so in the\nfollowing concurrency the request may be used after it has been freed:\n\n     mount  |   daemon_thread1    |    daemon_thread2\n------------------------------------------------------------\n cachefiles_ondemand_init_object\n  cachefiles_ondemand_send_req\n   REQ_A = kzalloc(sizeof(*req) + data_len)\n   wait_for_completion(\u0026REQ_A-\u003edone)\n            cachefiles_daemon_read\n             cachefiles_ondemand_daemon_read\n                                  // close dev fd\n                                  cachefiles_flush_reqs\n                                   complete(\u0026REQ_A-\u003edone)\n   kfree(REQ_A)\n              xa_lock(\u0026cache-\u003ereqs);\n              cachefiles_ondemand_select_req\n                req-\u003emsg.opcode != CACHEFILES_OP_READ\n                // req use-after-free !!!\n              xa_unlock(\u0026cache-\u003ereqs);\n                                   xa_destroy(\u0026cache-\u003ereqs)\n\nHence remove requests from cache-\u003ereqs when flushing them to avoid\naccessing freed requests."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cachefiles: elimina solicitudes de xarray durante las solicitudes de vaciado Incluso con CACHEFILES_DEAD configurado, a\u00fan podemos leer las solicitudes, por lo que en la siguiente concurrencia la solicitud se puede usar despu\u00e9s de que se haya liberado: mount | daemon_thread1 | daemon_thread2 ------------------------------------------------- --------- Cachefiles_ondemand_init_object Cachefiles_ondemand_send_req req_a = kzalloc (sizeof (*req) + data_len) Wait_for_completion (\u0026amp; req_a-\u0026gt; ded) gratis (req_a ) xa_lock(\u0026amp;cache-\u0026gt;reqs); cachefiles_ondemand_select_req req-\u0026gt;msg.opcode != CACHEFILES_OP_READ // \u00a1\u00a1\u00a1requiere use-after-free !!! xa_unlock(\u0026amp;cache-\u0026gt;reqs); xa_destroy(\u0026amp;cache-\u0026gt;reqs) Por lo tanto, elimine las solicitudes de cache-\u0026gt;reqs cuando las vac\u00ede para evitar acceder a las solicitudes liberadas."
    }
  ],
  "id": "CVE-2024-40900",
  "lastModified": "2024-11-21T09:31:49.010",
  "metrics": {},
  "published": "2024-07-12T13:15:13.433",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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