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THREAT OPS › Threat News › [NVD] CVE-2026-80978 (HIGH 7.8) — 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

[NVD] CVE-2026-80978 (HIGH 7.8) — 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

mednvdPublished 2026-09-11

CVE-2026-80978 CVSS: 7.8 HIGH Published: 2026-09-11T20:19:04.143

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

Indicators of compromise

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-80978