In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ipv6: flowlabel: cap duplicate leases per socket<\/p>\n
ipv6_flowlabel_get() allocates an ipv6_fl_socklist entry for every
\nsuccessful GET. The recheck path for a compatible existing flowlabel
\nlinks another lease without applying any lease admission check. Repeated
\nGET requests for one shareable label can therefore grow a socket’s lease
\nlist without bound.<\/p>\n
Reject a new unprivileged lease once the socket already holds
\nFL_MAX_PER_SOCK leases. Check this on the shared recheck path so reuse
\nof a globally interned label, including the fl_intern() collision path,
\nis covered as well. New-label admission remains under the existing
\nmem_check() policy.<\/p>\n
Use capable(CAP_NET_ADMIN) rather than ns_capable(), matching
\nmem_check(). An unprivileged user must not bypass the cap by creating a
\nuser namespace and a netns where they have CAP_NET_ADMIN, which would
\nstill consume host memory.<\/p>\n
Check the capability only when the socket reaches the limit, so
\nsuccessful unprivileged GET requests below the cap do not generate a
\ncapability audit. Do the admission check before updating linger and
\nexpires so a rejected GET does not refresh the shared label, matching
\nthe existing socket-list allocation failure path.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ipv6: flowlabel: cap duplicate leases per socket<\/p>\n
ipv6_flowlabel_get() allocates an ipv6_fl_socklist entry for every
\nsuccessful GET<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-29029","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/29029","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=29029"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29029"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29029"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}