CVE-2026-80978Medium· 5.5▾ SunlitA flaw was found in the Linux kernel, specifically within its IP tunnel devices. A local attacker could create a stack of user-controlled IP tunnel devices, causing the system to miscalculate the required memory for network packet headers.…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the vendor's CSAF advisory record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
— → 4.1
none → medium
— → 4.1
none → medium
— → 7.8
none → high
7.8 → 4.1
high → medium
7.8 → 7
0.2% → 0.2%
7 → 7.8
Last analysed / modified upstream
7.8 → 5.5
high → medium
A flaw was found in the Linux kernel, specifically within its IP tunnel devices. A local attacker could create a stack of user-controlled IP tunnel devices, causing the system to miscalculate the required memory for network packet headers. This miscalculation can lead to unnecessary memory reallocations during packet transmission, which may result in performance degradation for network operations.
kernel: net: cap advertised IP tunnel headroom — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-10-24.
Affected:
No fix planned:
Out of support scope
Workarounds / mitigations:
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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