{"cve":"CVE-2024-40900","nvd":{"published":"2024-07-12T13:15:13.433","modified":"2026-08-04T11:19:02.990","status":"Modified","description":"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(&REQ_A->done)\n            cachefiles_daemon_read\n             cachefiles_ondemand_daemon_read\n                                  // close dev fd\n                                  cachefiles_flush_reqs\n                                   complete(&REQ_A->done)\n   kfree(REQ_A)\n              xa_lock(&cache->reqs);\n              cachefiles_ondemand_select_req\n                req->msg.opcode != CACHEFILES_OP_READ\n                // req use-after-free !!!\n              xa_unlock(&cache->reqs);\n                                   xa_destroy(&cache->reqs)\n\nHence remove requests from cache->reqs when flushing them to avoid\naccessing freed requests.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-416"],"references":["https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013","https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19","https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598","https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7","https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:52:42.518321223+00:00"},"epss":{"cve":"CVE-2024-40900","score":0.00284,"percentile":0.20926,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}