https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Thu, 01 Oct 2026 01:35:29 +0000 https://vulnerability.circl.lu/vuln/cve-2022-49303 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>drivers: staging: rtl8192eu: Fix deadlock in rtw_joinbss_event_prehandle</p> <p>There is a deadlock in rtw_joinbss_event_prehandle(), which is shown below:</p> <p>(Thread 1) | (Thread 2) | _set_timer() rtw_joinbss_event_prehandle()| mod_timer() spin_lock_bh() //(1) | (wait a time) ... | rtw_join_timeout_handler() | _rtw_join_timeout_handler() del_timer_sync() | spin_lock_bh() //(2) (wait timer to stop) | ...</p> <p>We hold pmlmepriv-&gt;lock in position (1) of thread 1 and use del_timer_sync() to wait timer to stop, but timer handler also need pmlmepriv-&gt;lock in position (2) of thread 2. As a result, rtw_joinbss_event_prehandle() will block forever.</p> <p>This patch extracts del_timer_sync() from the protection of spin_lock_bh(), which could let timer handler to obtain the needed lock. What`s more, we change spin_lock_bh() to spin_lock_irq() in _rtw_join_timeout_handler() in order to prevent deadlock.</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>drivers: staging: rtl8192eu: Fix deadlock in rtw_joinbss_event_prehandle</p> <p>There is a deadlock in rtw_joinbss_event_prehandle(), which is shown below:</p> <p>(Thread 1) | (Thread 2) | _set_timer() rtw_joinbss_event_prehandle()| mod_timer() spin_lock_bh() //(1) | (wait a time) ... | rtw_join_timeout_handler() | _rtw_join_timeout_handler() del_timer_sync() | spin_lock_bh() //(2) (wait timer to stop) | ...</p> <p>We hold pmlmepriv-&gt;lock in position (1) of thread 1 and use del_timer_sync() to wait timer to stop, but timer handler also need pmlmepriv-&gt;lock in position (2) of thread 2. As a result, rtw_joinbss_event_prehandle() will block forever.</p> <p>This patch extracts del_timer_sync() from the protection of spin_lock_bh(), which could let timer handler to obtain the needed lock. What`s more, we change spin_lock_bh() to spin_lock_irq() in _rtw_join_timeout_handler() in order to prevent deadlock.</p> https://vulnerability.circl.lu/vuln/cve-2022-49303