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[rlc-10/6.12.0-211.65.1.el10_2] ipv4: validate checksum_start before completing checksum - #1715
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cve CVE-2026-99999 commit-author Michael S. Tsirkin <mst@redhat.com> commit 6785011 If a packet with bad checksum metadata gets into the ipv4 stack, skb_checksum_help can corrupt the network header and cause a bunch of mischief. This was discovered and reported by Paulos, and has been reporoduced by others independently since. We really shouldn't allow such packets in, but as a defence in depth measure, let's also check before we complete the checksum. A more complete validation at input is forthcoming, but needs more work. Cc: stable@vger.kernel.org Fixes: f43798c ("tun: Allow GSO using virtio_net_hdr") Fixes: bfd5f4a ("packet: Add GSO/csum offload support.") Reported-by: Paulos Yibelo <habte.yibelo@gmail.com> Closes: https://lore.kernel.org/netdev/20260922030310.8684-2-habte.yibelo@gmail.com/ Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Link: https://patch.msgid.link/0a012b4923e189c4c593ef4f471e5ff0edbe9030.1791412497.git.mst@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> (cherry picked from commit 6785011) Signed-off-by: Brett Mastbergen <bmastbergen@ciq.com>
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