In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
wifi: mac80211: tear down new links on vif update error path<\/p>\n
When ieee80211_vif_update_links() adds new links it allocates a link
\ncontainer for each and calls ieee80211_link_init() (which registers the
\nper-link debugfs files with file->private_data pointing into the container)
\nand ieee80211_link_setup(). If the subsequent drv_change_vif_links() fails,
\nthe error path restores the old pointers and jumps to ‘free’, which frees
\nthe new containers but never removes their debugfs entries or stops the
\nlinks. The debugfs files survive with file->private_data dangling at the
\nfreed container, so a later open()+read() (e.g. link-1\/txpower)
\ndereferences freed memory in ieee80211_if_read_link(), a use-after-free.<\/p>\n
The removal path already dismantles links correctly via
\nieee80211_tear_down_links(), which removes each link’s keys and debugfs
\nentries and calls ieee80211_link_stop(); the add path on the error branch
\ndoes not. Commit be1ba9ed221f (“wifi: mac80211: avoid weird state in error
\npath”) hardened this same error path for the link-removal case
\n(new_links == 0) but left the newly-added links’ teardown unaddressed.<\/p>\n
drv_change_vif_links() can fail at runtime on MLO drivers (internal
\nallocation \/ queue \/ firmware command failures).<\/p>\n
Remove the new links’ debugfs entries and stop them before freeing.<\/p>\n
BUG: KASAN: slab-use-after-free in ieee80211_if_read_link (net\/mac80211\/debugfs_netdev.c:127)
\n Read of size 8 at addr ffff888011290000 by task exploit\/145
\n Call Trace:
\n …
\n ieee80211_if_read_link (net\/mac80211\/debugfs_netdev.c:127)
\n short_proxy_read (fs\/debugfs\/file.c:373)
\n vfs_read (fs\/read_write.c:572)
\n ksys_read (fs\/read_write.c:716)
\n do_syscall_64 (arch\/x86\/entry\/syscall_64.c:94)
\n entry_SYSCALL_64_after_hwframe (arch\/x86\/entry\/entry_64.S:121)
\n …
\n Oops: general protection fault, probably for non-canonical address 0xdffffc000000000a
\n RIP: 0010:ieee80211_if_read_link (net\/mac80211\/debugfs_netdev.c:127)
\n Kernel panic – not syncing: Fatal exception<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
wifi: mac80211: tear down new links on vif update error path<\/p>\n
When ieee80211_vif_update_links() adds new links it allocates a link<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-4650","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/4650","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=4650"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4650"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4650"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}