In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
vxlan: use one headroom snapshot for neighbour replies<\/p>\n
vxlan_na_create() samples LL_RESERVED_SPACE() to size the reply skb and then
\nsamples it again to reserve headroom. A concurrent vxlan_changelink() can
\nupdate needed_headroom between the two reads, creating a TOCTOU race. The
\nsecond value can exceed the allocation and make the Ethernet header write out
\nof bounds.<\/p>\n
The race is reproducible on the unpatched kernel. It occurred when
\nvxlan_na_create() generated a neighbour reply while vxlan_changelink() changed
\nthe link headroom. KASAN caught a four-byte write two bytes beyond a 704-byte
\nskbuff_small_head allocation.<\/p>\n
Snapshot the headroom once and use that value for both allocation and
\nreservation.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
vxlan: use one headroom snapshot for neighbour replies<\/p>\n
vxlan_na_create() samples LL_RESERVED_SPACE() to size the reply skb and the<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-41040","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/41040","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=41040"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=41040"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=41040"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}