{"id":"CVE-2022-49309","title":"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 …","summary":"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 …","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-667"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel < 5.15.47","linux_kernel >= 5.16, < 5.17.15","linux_kernel >= 5.18, < 5.18.4"],"patched":["linux_kernel 5.18.4"],"published":"2025-02-26","updated":"2026-08-13","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2022-49309","references":[{"url":"https://git.kernel.org/stable/c/2c41f5c341853f84b7bc2f32605d4e2782e8c279","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c84e5c819600ee0628f61b33d145258ae0f3d7a7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cc7ad0d77b51c872d629bcd98aea463a3c4109e7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ce129d3efd181da5fd56f4360cc8827122afa67e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f89f6c3ebf69623b8ea48200bd690e9e210335a1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00199,"epssPercentile":0.09965,"ingestedAt":"2026-08-13T00:57:23.048Z","slug":"CVE-2022-49309","body":"## Overview\n\nIn 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->lock in position (1) of thread 1 and use\ndel_timer_sync() to wait timer to stop, but timer handler\nalso need pmlmepriv->lock 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.\n\n## Affected\n\n- `linux_kernel < 5.15.47`\n- `linux_kernel >= 5.16, < 5.17.15`\n- `linux_kernel >= 5.18, < 5.18.4`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 5.18.4`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}