{"id":"CVE-2023-53520","title":"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 …","summary":"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 …","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-362"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.7, < 6.1.55","linux_kernel >= 6.2, < 6.5.5"],"patched":["linux_kernel 6.5.5"],"published":"2025-10-01","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:17:42.087","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-53520","references":[{"url":"https://git.kernel.org/stable/c/06e2b5ad72b60f90bfe565c201346532e271f484","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/573ebae162111063eedc6c838a659ba628f66a0f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e1fa25a91091bbed691ba2996a6cee809e3309a2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f9c8ce5d665653e3cf71a76349d41d7a7f7947e6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00117,"epssPercentile":0.01656,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:35:21.506402Z"},"ingestedAt":"2026-10-15T22:48:25.406Z","slug":"CVE-2023-53520","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `linux_kernel >= 5.7, < 6.1.55`\n- `linux_kernel >= 6.2, < 6.5.5`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.5.5`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}