In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: tap: set skb->dev before parsing virtio net header in tap_get_user_xdp()<\/p>\n
The commit 4f61f133f354 (“net: tap: NULL pointer derefence in
\ndev_parse_header_protocol when skb->dev is null”) fixed a crash in
\ntap_get_user() by assigning skb->dev before calling tun_vnet_hdr_to_skb().
\nThis is required because virtio_net_hdr_to_skb() may invoke
\ndev_parse_header_protocol(), which dereferences skb->dev. Without the
\nassignment, a NULL pointer dereference can occur.<\/p>\n
However, tap_get_user_xdp() still parses the virtio-net header before
\nassigning skb->dev. When the vhost TX path passes an XDP buffer containing
\na GSO virtio-net header but the protocol is set to zero on purpose,
\ntun_vnet_hdr_to_skb() can reach dev_parse_header_protocol() while skb->dev
\nis still NULL, resulting in a crash.<\/p>\n
Fix this by looking up the tap device and assigning skb->dev before calling
\ntun_vnet_hdr_to_skb(), matching the ordering already used in
\ntap_get_user(). Preserve the existing RCU read-side critical section across
\ndev_queue_xmit().<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: tap: set skb->dev before parsing virtio net header in tap_get_user_xdp()<\/p>\n
The commit 4f61f133f354 (“net: tap: NULL pointer der<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-11260","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/11260","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=11260"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11260"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11260"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}