{"id":"CVE-2022-49309","summary":"drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback()\n\nThere is a deadlock in rtw_surveydone_event_callback(),\nwhich is shown below:\n\n   (Thread 1)                  |      (Thread 2)\n                               | _set_timer()\nrtw_surveydone_event_callback()|  mod_timer()\n spin_lock_bh() //(1)          |  (wait a time)\n ...                           | rtw_scan_timeout_handler()\n del_timer_sync()              |  spin_lock_bh() //(2)\n (wait timer to stop)          |  ...\n\nWe hold pmlmepriv-\u003elock in position (1) of thread 1 and use\ndel_timer_sync() to wait timer to stop, but timer handler\nalso need pmlmepriv-\u003elock in position (2) of thread 2.\nAs a result, rtw_surveydone_event_callback() will block forever.\n\nThis patch extracts del_timer_sync() from the protection of\nspin_lock_bh(), which could let timer handler to obtain\nthe needed lock. What`s more, we change spin_lock_bh() in\nrtw_scan_timeout_handler() to spin_lock_irq(). Otherwise,\nspin_lock_bh() will also cause deadlock() in timer handler.","modified":"2026-03-20T12:22:21.361665Z","published":"2025-02-26T02:10:40.167Z","related":["SUSE-SU-2025:1027-1","SUSE-SU-2025:1176-1","SUSE-SU-2025:1183-1","SUSE-SU-2025:1241-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49309.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2c41f5c341853f84b7bc2f32605d4e2782e8c279"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c84e5c819600ee0628f61b33d145258ae0f3d7a7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cc7ad0d77b51c872d629bcd98aea463a3c4109e7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ce129d3efd181da5fd56f4360cc8827122afa67e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f89f6c3ebf69623b8ea48200bd690e9e210335a1"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49309.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49309"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"554c0a3abf216c991c5ebddcdb2c08689ecd290b"},{"fixed":"c84e5c819600ee0628f61b33d145258ae0f3d7a7"},{"fixed":"f89f6c3ebf69623b8ea48200bd690e9e210335a1"},{"fixed":"ce129d3efd181da5fd56f4360cc8827122afa67e"},{"fixed":"2c41f5c341853f84b7bc2f32605d4e2782e8c279"},{"fixed":"cc7ad0d77b51c872d629bcd98aea463a3c4109e7"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49309.json"}}],"schema_version":"1.7.5"}