In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
wifi: cfg80211: only group hidden BSSes with beacon entries<\/p>\n
When a probe response for an unknown BSS comes in, __cfg80211_bss_update()
\nlooks for an existing entry with the same BSSID and a hidden (zero-length
\nor NUL-filled) SSID, and if it finds one it groups them, using the beacon
\nIEs from the existing entry.<\/p>\n
But that could find another entry without a beacon, if it was also from a
\nprobe response (with SSID), so there’s a group without beacon elements.<\/p>\n
If a beacon with a hidden SSID for that BSSID arrives later,
\ncfg80211_combine_bsses() goes looking for the probe response entries that
\nbelong to it – i.e. entries with the same BSSID and channel that have no
\nbeacon IEs – and finds those two. They are already grouped with each
\nother, so it hits its<\/p>\n
WARN_ON_ONCE(bss->pub.hidden_beacon_bss)
\n WARN_ON_ONCE(!list_empty(&bss->hidden_list))<\/p>\n
which are there because an entry without beacon elements is not supposed
\nto be part of a group yet.<\/p>\n
Only combine entries when a beacon was already received, ones that are
\nkept separate will be combined when a beacon arrives.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
wifi: cfg80211: only group hidden BSSes with beacon entries<\/p>\n
When a probe response for an unknown BSS comes in, __cfg80211_bss_upda<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-33409","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/33409","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=33409"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=33409"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=33409"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}