ip6_gre: fix hardware header length for NBMA tunnels (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.13 % · percentile 3 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
Description
In the Linux kernel, the following vulnerability has been resolved: ip6_gre: fix hardware header length for NBMA tunnels ip6gre_tnl_link_config_route() accumulates the lower device's hardware header length into dev->hard_header_len whenever header_ops is set. This is incorrect for both users of header_ops. ip6gretap and ip6erspan have a fixed Ethernet hardware header length. For an NBMA ip6gre tunnel, ip6gre_header() creates only the GRE header, the optional FOU or GUE header, and the outer IPv6 header. The lower device header is headroom needed later, not part of the tunnel device's hardware header. Keep the lower device header in needed_headroom. Set hard_header_len to the tunnel header length only for ARPHRD_IP6GRE devices with header_ops, and leave the fixed Ethernet header length unchanged for tap and erspan devices.
References
- https://git.kernel.org/stable/c/cb1afd087aedc90e5274537e4fb9bf3f98e5afdb
- https://git.kernel.org/stable/c/7719f6e7ed2ffddc2c3bb61f4467b76d49e0af6a
- https://git.kernel.org/stable/c/b1e95e3602d8e112458627f14c6c31c21f2188cb
- https://git.kernel.org/stable/c/c3457a5aae5fb43f7023d3f3dc472c2afa22acf0
- https://git.kernel.org/stable/c/8bfe746afee38dd6e4348ddcd22d554789dbb9ff
- https://git.kernel.org/stable/c/b8282668d8fa7c61b80e8e4890729031c291a16c
- https://git.kernel.org/stable/c/565038b0092f65afe384961c0f548d605bf438b9
- https://git.kernel.org/stable/c/505b6d296c486ef7d1274f279d4c43a172f63224
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | Linux |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-76473
- GCVE · GCVE-0-2026-89562
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1375 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1289 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1253 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 832ba596494b2c9eac7760259eff2d8b7dcad0ee < cb1afd087aedc90e5274537e4fb9bf3f98e5afdb ; affected 832ba596494b2c9eac7760259eff2d8b7dcad0ee < 7719f6e7ed2ffddc2c3bb61f4467b76d49e0af6a ; affected 832ba596494b2c9eac7760259eff2d8b7dcad0ee < b1e95e3602d8e112458627f14c6c31c21f2188cb ; affected 832ba596494b2c9eac7760259eff2d8b7dcad0ee < c3457a5aae5fb43f7023d3f3dc472c2afa22acf0 ; affected 832ba596494b2c9eac7760259eff2d8b7dcad0ee < 8bfe746afee38dd6e4348ddcd22d554789dbb9ff ; affected 832ba596494b2c9eac7760259eff2d8b7dcad0ee < b8282668d8fa7c61b80e8e4890729031c291a16c |
| Linux · Linux | affected 5.10 ; unaffected 0 < 5.10 ; unaffected 5.10.270 ≤ 5.10.* ; unaffected 5.15.221 ≤ 5.15.* ; unaffected 6.1.188 ≤ 6.1.* ; unaffected 6.6.157 ≤ 6.6.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |