In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
wifi: mt76: use kfree_rcu for offchannel link in mt76_put_vif_phy_link<\/p>\n
mt76_put_vif_phy_link() frees the offchannel mlink with plain kfree()
\nafter rcu_assign_pointer(NULL). However, rcu_assign_pointer only prevents
\nfuture RCU readers from obtaining the pointer — it does not wait for
\nexisting readers that already hold it via rcu_dereference.<\/p>\n
The TX datapath (e.g. mt7996_mac_write_txwi) dereferences mlink->wcid
\nand mlink->idx under rcu_read_lock. If a TX softirq obtained the pointer
\nvia rcu_dereference just before the NULL assignment, it will dereference
\nfreed memory after the kfree.<\/p>\n
struct mt76_vif_link already contains an rcu_head field that is unused at
\nthis free site — a developer oversight, since the adjacent
\nkfree_rcu_mightsleep call for rx_sc in the same function shows the
\npattern was understood.<\/p>\n
Replace kfree(mlink) with kfree_rcu(mlink, rcu_head).<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
wifi: mt76: use kfree_rcu for offchannel link in mt76_put_vif_phy_link<\/p>\n
mt76_put_vif_phy_link() frees the offchannel mlink with pla<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-7272","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/7272","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=7272"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7272"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7272"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}