In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
packet: use consistent hard_header_len in non-ring send paths<\/p>\n
packet_snd() reads dev->hard_header_len multiple times while allocating
\nand constructing an skb. Device reconfiguration can change this value
\nconcurrently, for example through bonding device type changes.<\/p>\n
For SOCK_RAW, packet_snd() can save a larger value in reserve and later
\nallocate headroom using a smaller value. Moving skb->data back by reserve
\nthen places it before skb->head, and the following copy from userspace can
\nattempt an out-of-bounds write.<\/p>\n
packet_sendmsg_spkt() has the same issue because it calculates its
\nreservation and header offset from separate reads before dropping the RCU
\nread lock to allocate the skb.<\/p>\n
Add LL_RESERVED_SPACE_EX() for callers that already saved a header length.
\nRead hard_header_len once in packet_snd() and use it for allocation and
\nconstruction. In packet_sendmsg_spkt(), preserve the allocation-time value
\nthrough the device lookup retry.<\/p>\n
The separate SOCK_DGRAM consistency problem between hard_header_len and
\nheader_ops->create is not addressed here.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
packet: use consistent hard_header_len in non-ring send paths<\/p>\n
packet_snd() reads dev->hard_header_len multiple times while allocat<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-11116","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/11116","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=11116"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11116"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11116"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}