CVE-2026-80978 | In the Linux kernel, the following vulnerability has been resolved: net: cap advertised IP tunnel headroom IP tunnel devices derive their advertised needed_headroom from lower output devices. A stack of user-created devices can make the derived value larger than the 16-bit skb header offsets can represent. Once IP output reserves it, skb head expansion can wrap those offsets. The runtime transmit path already caps a growing needed_headroom at 512. Apply th
In the Linux kernel, the following vulnerability has been resolved:
net: cap advertised IP tunnel headroom
IP tunnel devices derive their advertised needed_headroom from lower
output devices. A stack of user-created devices can make the derived
value larger than the 16-bit skb header offsets can represent. Once IP
output reserves it, skb head expansion can wrap those offsets.
The runtime transmit path already caps a growing needed_headroom at 512.
Apply the same cap when tunnel configuration publishes needed_headroom
derived from a lower output device.
Capping the advertised value is safe: IP tunnel transmit still expands
the skb when a packet needs more headroom. A nonsensical stacked
configuration can therefore incur an extra reallocation, but it cannot
publish an unbounded reservation to upper layers.
- 🔗 git.kernel.org/stable/c/fb889a619723032140f5d983a3a34d25…
- 🔗 git.kernel.org/stable/c/b160422f8103574425e2834130e169d8…
- 🔗 git.kernel.org/stable/c/d36e75f5669140b66515ad3a176ca633…
- 🔗 git.kernel.org/stable/c/84783961cb8bdb36b4f41a02ce43aafc…
- 🔗 git.kernel.org/stable/c/bc4e05ae66c9797a0972ac44326e69c5…
- 🔗 git.kernel.org/stable/c/af0ee8f04bea22cdb331fa3509e17f81…
- 🔗 git.kernel.org/stable/c/9144f2c53a04465a6878172b523f6403…
- 🔗 git.kernel.org/stable/c/6b222adeb9340306e2ff97127c76117a…
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CVE-2026-80978 | In the Linux kernel, the following vulnerability has been resolved: net: cap advertised IP tunnel headroom IP tunnel devices derive their advertised needed_headroom from lower output devices. A stack of user-created devices can make the derived value larger than the 16-bit skb header offsets can represent. Once IP output reserves it, skb head expansion can wrap those offsets. The runtime transmit path already caps a growing needed_headroom at 512. Apply th
In the Linux kernel, the following vulnerability has been resolved: net: cap advertised IP tunnel headroom IP tunnel devices derive their advertised needed_headroom from lower output devices. A stack of user-created devices can make the d