{"cve":"CVE-2023-53520","nvd":{"published":"2025-10-01T12:15:56.323","modified":"2026-10-15T22:17:42.087","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: Fix hci_suspend_sync crash\n\nIf hci_unregister_dev() frees the hci_dev object but hci_suspend_notifier\nmay still be accessing it, it can cause the program to crash.\nHere's the call trace:\n  <4>[102152.653246] Call Trace:\n  <4>[102152.653254]  hci_suspend_sync+0x109/0x301 [bluetooth]\n  <4>[102152.653259]  hci_suspend_dev+0x78/0xcd [bluetooth]\n  <4>[102152.653263]  hci_suspend_notifier+0x42/0x7a [bluetooth]\n  <4>[102152.653268]  notifier_call_chain+0x43/0x6b\n  <4>[102152.653271]  __blocking_notifier_call_chain+0x48/0x69\n  <4>[102152.653273]  __pm_notifier_call_chain+0x22/0x39\n  <4>[102152.653276]  pm_suspend+0x287/0x57c\n  <4>[102152.653278]  state_store+0xae/0xe5\n  <4>[102152.653281]  kernfs_fop_write+0x109/0x173\n  <4>[102152.653284]  __vfs_write+0x16f/0x1a2\n  <4>[102152.653287]  ? selinux_file_permission+0xca/0x16f\n  <4>[102152.653289]  ? security_file_permission+0x36/0x109\n  <4>[102152.653291]  vfs_write+0x114/0x21d\n  <4>[102152.653293]  __x64_sys_write+0x7b/0xdb\n  <4>[102152.653296]  do_syscall_64+0x59/0x194\n  <4>[102152.653299]  entry_SYSCALL_64_after_hwframe+0x5c/0xc1\n\nThis patch holds the reference count of the hci_dev object while\nprocessing it in hci_suspend_notifier to avoid potential crash\ncaused by the race condition.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","score":4.7},"cwes":["CWE-362"],"references":["https://git.kernel.org/stable/c/06e2b5ad72b60f90bfe565c201346532e271f484","https://git.kernel.org/stable/c/573ebae162111063eedc6c838a659ba628f66a0f","https://git.kernel.org/stable/c/e1fa25a91091bbed691ba2996a6cee809e3309a2","https://git.kernel.org/stable/c/f9c8ce5d665653e3cf71a76349d41d7a7f7947e6"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:11:26.888974865+00:00"},"epss":{"cve":"CVE-2023-53520","score":0.00117,"percentile":0.01656,"date":"2026-10-25"},"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."]}