In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
vlan: ensure sufficient headroom in vlan_dev_hard_header()<\/p>\n
Callers that only reserve ETH_HLEN or less (such as llc_alloc_frame()),
\nor skbs allocated before dynamic device\/headroom changes (e.g. toggling
\nVLAN_FLAG_REORDER_HDR or bonding\/team switching slaves), can reach
\nvlan_dev_hard_header() with insufficient headroom and trigger
\nskb_under_panic().<\/p>\n
Use skb_cow_head() in vlan_dev_hard_header() when VLAN_FLAG_REORDER_HDR
\nis not set to ensure sufficient headroom for the VLAN header(s) and the
\nunderlying device hard header.<\/p>\n
Use READ_ONCE() to read dev->hard_header_len and dev->needed_headroom as
\nthey can be updated concurrently under RTNL (e.g. in
\nvlan_transfer_features()) while vlan_dev_hard_header() runs locklessly on
\nthe transmit path. Also avoid LL_RESERVED_SPACE(dev) here so that the
\nextra HH_DATA_MOD alignment padding does not trigger unnecessary
\npskb_expand_head() reallocations on inner stacked VLAN devices after the
\nouter VLAN header has been pushed.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
vlan: ensure sufficient headroom in vlan_dev_hard_header()<\/p>\n
Callers that only reserve ETH_HLEN or less (such as llc_alloc_frame()),<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-41026","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/41026","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=41026"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=41026"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=41026"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}