UNKNOWN NVD
CVE-2026-89562
In the Linux kernel, the following vulnerability has been resolved: ip6_gre: fix hardware header length for NBMA tunnels ip6gre_tnl_link_config_route() accumu
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.
References
- https://git.kernel.org/stable/c/505b6d296c486ef7d1274f279d4c43a172f63224
- https://git.kernel.org/stable/c/565038b0092f65afe384961c0f548d605bf438b9
- https://git.kernel.org/stable/c/8bfe746afee38dd6e4348ddcd22d554789dbb9ff
- https://git.kernel.org/stable/c/b8282668d8fa7c61b80e8e4890729031c291a16c
This unknown severity vulnerability was published on 2026-09-11 via NVD.
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