In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
batman-adv: reject unrepresentable multicast TVLV offsets<\/p>\n
The network and transport header fields in struct sk_buff are 16-bit
\noffsets from skb->head, and U16_MAX is reserved as the unset transport
\nheader value. batadv_tvlv_call_handler() sets both fields from a received
\nmulticast TVLV without checking whether the TVLV end is representable.<\/p>\n
If the end offset exceeds the field’s range, skb_set_transport_header()
\ntruncates it so that the transport header precedes the network header.
\nThe negative difference is then returned by skb_network_header_len() as
\na large u32. batadv_mcast_forw_packet() consequently accepts an oversized
\nmulticast tracker and accesses memory beyond the skb data.<\/p>\n
Add skb_set_transport_header_careful(), an offset-aware counterpart to
\nskb_reset_transport_header_careful(), which validates the final
\nhead-relative offset before assigning it. Use the new helper in
\nbatadv_tvlv_call_handler() and reject unrepresentable TVLVs before
\nsetting the network header.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
batman-adv: reject unrepresentable multicast TVLV offsets<\/p>\n
The network and transport header fields in struct sk_buff are 16-bit
\noff<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-17343","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/17343","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=17343"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17343"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17343"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}