CVE record · CVE-2026-80905

net: tap: fix wrong transport_header when sending VLAN-tagged frame

No CVSS scoreEPSS 0.0020 · 10th percentile

Published by the CVE Program (CNA: Linux) at 4 Sept 2026, 17:19 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Linux	Linux	affected 8c76e77f9069f10505c08e02646c3ee11ad79038 to before a8f49e83e4447b885376e6a937d62df883cc8824 git affected 8c76e77f9069f10505c08e02646c3ee11ad79038 to before c0376820922d255ae1d103c32345a6ec4c3266f7 git affected 8c76e77f9069f10505c08e02646c3ee11ad79038 to before f1d297cad5c1eacd9fadfd0346ad97405ffbf97c git affected 8c76e77f9069f10505c08e02646c3ee11ad79038 to before 5ffaa5d7f56ab24a8e23cf131eadfef31a3bbc4b git affected 8c76e77f9069f10505c08e02646c3ee11ad79038 to before 88b79ac89ecc04d7f2613f7e1c0b46f0c4ddb2f3 git affected 8c76e77f9069f10505c08e02646c3ee11ad79038 to before cbb35cbe8db268fefe34c23df15348cf99025298 git affected 3cae5ef1f37a475faf7c40bc6a3c170779f3e0b1 git affected 4.20.1 to before 4.21 semver Other versions: unaffected
Linux	Linux	affected 5.0 unaffected before 5.0 semver unaffected 6.1.191 to 6.1., inclusive semver unaffected 6.6.160 to 6.6., inclusive semver unaffected 6.12.114 to 6.12., inclusive semver unaffected 6.18.46 to 6.18., inclusive semver unaffected 7.1.10 to 7.1., inclusive semver unaffected 7.2 to , inclusive original_commit_for_fix Other versions: affected

Identifiers: CVE-2026-80905
CNA: Linux
Tags: Linux kernel
Published: 4 Sept 2026
Updated: 30 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The Linux kernel tap driver can set a wrong transport header for VLAN-tagged frames, leaving it uninitialized. Affected versions start at 5.0; the source gives few details on attacker requirements or impact. Upgrade to Linux 6.1.191 or later, 6.6.160 or later, 6.12.114 or later, or 6.18.46 or later, depending on your series.

Written 12 Nov 2026.

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

No source has published a CVSS score for this record yet.

CISA KEV Not listed.
EPSS 0.0020, the 10th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 4 Sept 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.