In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: ip_tunnel: initialize `options_len` before referencing options<\/p>\n
The following command triggers a kernel panic:<\/p>\n
ip link add d0 type dummy; ip link set d0 up
\n ip route add 10.30.0.0\/16
\n encap ip id 300 geneve_opts 4660:66:11223344 dev d0<\/p>\n
memcpy: detected buffer overflow: 4 byte write of buffer size 0
\n kernel BUG at lib\/string_helpers.c:1044!
\n …
\n ip_tun_parse_opts.part.0.cold+0x10\/0x10
\n ip_tun_build_state+0x116\/0x2a0<\/p>\n
On kernels built with GCC 15+ and `CONFIG_FORTIFY_SOURCE`, the fortified
\n`memcpy()` got 0 sized destination with request of 4 bytes length:<\/p>\n
static int ip_tun_parse_opts_geneve(…)
\n {
\n …
\n attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA];
\n data_len = nla_len(attr); \/* == 4 *\/<\/p>\n
struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len;
\n memcpy(opt->opt_data, nla_data(attr), data_len);
\n \/* ^^^^^^^^^^^^^ 0 since options_len is assigned afterwards *\/<\/p>\n
Fixed by initializing the counter before the options are referenced.
\nMatching what `tunnel_key_opts_set()` already does.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: ip_tunnel: initialize `options_len` before referencing options<\/p>\n
The following command triggers a kernel panic:<\/p>\n
ip link add <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-33309","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/33309","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=33309"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=33309"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=33309"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}