7.8

CVE-2026-80978: linux

CVSS: 7.8v3.1HighReceived
AliasesUBUNTU-CVE-2026-80978DEBIAN-CVE-2026-80978
Published 11-09-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-80978 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.3% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.13%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:11805-1

Timeline

  1. 11-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

0.00 pp

From 0.13% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.13%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu169 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.111-1 | < 7.2.6-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ 1a37e412a0225fcba5587f24c0dfc7636efc8b69, < fb889a619723032140f5d983a3a34d25a5a2bed4 | ≥ 1a37e412a0225fcba5587f24c0dfc7636efc8b69, < b160422f8103574425e2834130e169d84c94fa1d | ≥ 1a37e412a0225fcba5587f24c0dfc7636efc8b69, < d36e75f5669140b66515ad3a176ca6337bd80a5e | ≥ 1a37e412a0225fcba5587f24c0dfc7636efc8b69, < 84783961cb8bdb36b4f41a02ce43aafc6d52b176 | ≥ 1a37e412a0225fcba5587f24c0dfc7636efc8b69, < bc4e05ae66c9797a0972ac44326e69c5305e0020 | ≥ 1a37e412a0225fcba5587f24c0dfc7636efc8b69, < af0ee8f04bea22cdb331fa3509e17f81b48938ad | ≥ 1a37e412a0225fcba5587f24c0dfc7636efc8b69, < 9144f2c53a04465a6878172b523f640313c5559e | ≥ 1a37e412a0225fcba5587f24c0dfc7636efc8b69, < 6b222adeb9340306e2ff97127c76117abb9b3df8 | 3.11

3 vendors · 172 products

References

13 links
Show all 13 references