CVE-2026-80978
CVE CVE-2026-80978EUVD EUVD-2026-76301Published 2026-09-11T19:42:39.000ZLast changed 2026-09-14T11:59:23.000ZCVSS 7.8
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 6.6.157; 1a37e412a0225fcba5587f24c0dfc7636efc8b69 <d36e75f5669140b66515ad3a176ca6337bd80a5e; 1a37e412a0225fcba5587f24c0dfc7636efc8b69 <b160422f8103574425e2834130e169d84c94fa1d; patch: 5.10.270; 3.11; patch: 7.2.4; 1a37e412a0225fcba5587f24c0dfc7636efc8b69 <bc4e05ae66c9797a0972ac44326e69c5305e0020; patch: 6.1.188; patch: 6.12.109; 1a37e412a0225fcba5587f24c0dfc7636efc8b69 <6b222adeb9340306e2ff97127c76117abb9b3df8; patch: 0; 1a37e412a0225fcba5587f24c0dfc7636efc8b69 <9144f2c53a04465a6878172b523f640313c5559e; 1a37e412a0225fcba5587f24c0dfc7636efc8b69 <af0ee8f04bea22cdb331fa3509e17f81b48938ad; 1a37e412a0225fcba5587f24c0dfc7636efc8b69 <fb889a619723032140f5d983a3a34d25a5a2bed4; patch: 6.18.50; patch: 7.3-rc1; 1a37e412a0225fcba5587f24c0dfc7636efc8b69 <84783961cb8bdb36b4f41a02ce43aafc6d52b176; patch: 5.15.221
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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