CVE-2024-40900 (GCVE-0-2024-40900)
Vulnerability from cvelistv5
Published
2024-07-12 12:20
Modified
2025-05-04 09:17
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
Impacted products
Vendor Product Version
Linux Linux Version: c8383054506c77b814489c09877b5db83fd4abf2
Version: c8383054506c77b814489c09877b5db83fd4abf2
Version: c8383054506c77b814489c09877b5db83fd4abf2
Version: c8383054506c77b814489c09877b5db83fd4abf2
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\"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/cachefiles/daemon.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7\"}, {\"url\": \"https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598\"}, {\"url\": \"https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19\"}, {\"url\": \"https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.95\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.35\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.6\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"5.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:17:24.646Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-40900\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T09:17:24.646Z\", \"dateReserved\": \"2024-07-12T12:17:45.579Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-12T12:20:42.192Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}