net: ip_tunnel: initialize `options_len` before referencing options

Summary

In the Linux kernel, the following vulnerability has been resolved: net: ip_tunnel: initialize `options_len` before referencing options The following command triggers a kernel panic: ip link add d0 type dummy; ip link set d0 up ip route add 10.30.0.0/16 \ encap ip id 300 geneve_opts 4660:66:11223344 dev d0 memcpy: detected buffer overflow: 4 byte write of buffer size 0 kernel BUG at lib/string_helpers.c:1044! ... ip_tun_parse_opts.part.0.cold+0x10/0x10 ip_tun_build_state+0x116/0x2a0 On kernels built with GCC 15+ and `CONFIG_FORTIFY_SOURCE`, the fortified `memcpy()` got 0 sized destination with request of 4 bytes length: static int ip_tun_parse_opts_geneve(...) { ... attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA]; data_len = nla_len(attr); /* == 4 */ struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len; memcpy(opt->opt_data, nla_data(attr), data_len); /* ^^^^^^^^^^^^^ 0 since options_len is assigned afterwards */ Fixed by initializing the counter before the options are referenced. Matching what `tunnel_key_opts_set()` already does.

Timeline

1. Oct 6, 2026, 8:45 AM UTCCVE published
2. Oct 19, 2026, 9:16 AM UTCRecord last updated

Affected versions

• Linux Linux

  From bb5e62f2d547c4de6d1b144cbce2373a76c33f18 · fixed in 9907325257b4b382f26aafd5d9a8d47915907dd5; From bb5e62f2d547c4de6d1b144cbce2373a76c33f18 · fixed in 0f6a6beb01c068fcd5274eabf22c260039749fea; From bb5e62f2d547c4de6d1b144cbce2373a76c33f18 · fixed in 455ebeadf714f51e1dbbd6a022c74c9215b1cd76

• Linux Linux

  6.15

• KernelLinux

  From 6.15.0 · fixed in 6.18.54; From 6.19.0 · fixed in 7.2.8

References 3