In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
wifi: wcn36xx: Fix potential use-after-free in TX ack timer teardown<\/p>\n
wcn36xx_dxe_deinit() tears down the TX ack timer with timer_delete(),
\nwhich only dequeues the timer and does not wait for a callback that is
\nalready executing; the preceding free_irq() calls synchronize the
\ninterrupt handlers only. The callback, wcn36xx_dxe_tx_timer(), can
\ntherefore be running past the teardown and use the wcn freed along
\nwith the ieee80211_hw in wcn36xx_remove(): it takes wcn->dxe_lock,
\nreads wcn->tx_ack_skb and passes wcn->hw to
\nieee80211_tx_status_irqsafe().<\/p>\n
Fix this by using timer_shutdown_sync(), which waits for a running
\ncallback and also prevents the timer from being rearmed again. The
\ntimer is set up again by wcn36xx_dxe_init() on the next start, so the
\nstart\/stop cycle is unaffected.<\/p>\n
This issue was found by an in-house static analysis tool.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
wifi: wcn36xx: Fix potential use-after-free in TX ack timer teardown<\/p>\n
wcn36xx_dxe_deinit() tears down the TX ack timer with timer_d<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-33261","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/33261","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=33261"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=33261"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=33261"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}