In the Linux kernel, the following vulnerability has been resolved:
ip6_gre: fix hardware header length for NBMA tunnels
ip6gre_tnl_link_config_route() accumulates the lower device's hardware header length into dev->hard_header_len whenever header_ops is set. This is incorrect for both users of header_ops.
ip6gretap and ip6erspan have a fixed Ethernet hardware header length. For an NBMA ip6gre tunnel, ip6gre_header() creates only the GRE header, the optional FOU or GUE header, and the outer IPv6 header. The lower device header is headroom needed later, not part of the tunnel device's hardware header.
Keep the lower device header in needed_headroom. Set hard_header_len to the tunnel header length only for ARPHRD_IP6GRE devices with header_ops, and leave the fixed Ethernet header length unchanged for tap and erspan devices.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade bpftoolUpgrade kernelUpgrade python3-perf-debuginfoUpgrade python3-perfUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-modules-extra-commonUpgrade kernel-tools-develUpgrade kernel-headersUpgrade kernel-modules-extraUpgrade kernel-develUpgrade kernel-livepatch-6.1.188-233.385Upgrade kernel-debuginfoUpgrade perfUpgrade perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-toolsUpgrade bpftool-debuginfo | Oct 13, 2026 | Sep 11, 2026 |
| Debian | — | Upgrade linux-6.12Upgrade linux | Sep 30, 2026 | Sep 11, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 21, 2026 | Sep 11, 2026 |
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