In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: cap advertised IP tunnel headroom<\/p>\n
IP tunnel devices derive their advertised needed_headroom from lower
\noutput devices. A stack of user-created devices can make the derived
\nvalue larger than the 16-bit skb header offsets can represent. Once IP
\noutput reserves it, skb head expansion can wrap those offsets.<\/p>\n
The runtime transmit path already caps a growing needed_headroom at 512.
\nApply the same cap when tunnel configuration publishes needed_headroom
\nderived from a lower output device.<\/p>\n
Capping the advertised value is safe: IP tunnel transmit still expands
\nthe skb when a packet needs more headroom. A nonsensical stacked
\nconfiguration can therefore incur an extra reallocation, but it cannot
\npublish an unbounded reservation to upper layers.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: cap advertised IP tunnel headroom<\/p>\n
IP tunnel devices derive their advertised needed_headroom from lower
\noutput devices. A stac<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21311","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21311","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=21311"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21311"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21311"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}