In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
geneve: require CAP_NET_ADMIN in the device netns for changelink<\/p>\n
A tunnel changelink() operates on at most two netns, dev_net(dev) and
\nthe sticky underlay netns geneve->net. They differ once the device is
\ncreated in or moved to a netns other than the one the request runs in.
\nThe rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev),
\nso a caller privileged there but not in geneve->net can rewrite a geneve
\ndevice whose underlay lives in geneve->net.<\/p>\n
geneve_changelink() applies the new configuration against geneve->net:
\ngeneve_link_config() and the geneve_quiesce()\/geneve_unquiesce() pair
\nreopen the underlay sockets in that netns (geneve_sock_add() uses
\ngeneve->net), so the same reasoning as the tunnel changelink series
\napplies here.<\/p>\n
Gate geneve_changelink() with rtnl_dev_link_net_capable(), at the top of
\nthe op before any attribute is parsed, matching ipgre_changelink() and
\nthe rest of the “require CAP_NET_ADMIN in the device netns for
\nchangelink” series.<\/p>\n
Found by 0sec automated security-research tooling (https:\/\/0sec.ai).<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
geneve: require CAP_NET_ADMIN in the device netns for changelink<\/p>\n
A tunnel changelink() operates on at most two netns, dev_net(dev)<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-5349","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/5349","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=5349"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5349"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5349"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}