ip6_gre: fix hardware header length for NBMA tunnels

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89562
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:40 UTC
Updated2026-09-14 13:19:11 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001280000 probability, percentile 0.028310000 (date 2026-09-14)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 832ba596494b2c9eac7760259eff2d8b7dcad0ee cb1afd087aedc90e5274537e4fb9bf3f98e5afdb git Not specified
CNA Linux Linux affected 832ba596494b2c9eac7760259eff2d8b7dcad0ee 7719f6e7ed2ffddc2c3bb61f4467b76d49e0af6a git Not specified
CNA Linux Linux affected 832ba596494b2c9eac7760259eff2d8b7dcad0ee b1e95e3602d8e112458627f14c6c31c21f2188cb git Not specified
CNA Linux Linux affected 832ba596494b2c9eac7760259eff2d8b7dcad0ee c3457a5aae5fb43f7023d3f3dc472c2afa22acf0 git Not specified
CNA Linux Linux affected 832ba596494b2c9eac7760259eff2d8b7dcad0ee 8bfe746afee38dd6e4348ddcd22d554789dbb9ff git Not specified
CNA Linux Linux affected 832ba596494b2c9eac7760259eff2d8b7dcad0ee b8282668d8fa7c61b80e8e4890729031c291a16c git Not specified
CNA Linux Linux affected 832ba596494b2c9eac7760259eff2d8b7dcad0ee 565038b0092f65afe384961c0f548d605bf438b9 git Not specified
CNA Linux Linux affected 832ba596494b2c9eac7760259eff2d8b7dcad0ee 505b6d296c486ef7d1274f279d4c43a172f63224 git Not specified
CNA Linux Linux affected cf3d9717a5271573fa193c4dfa0df856295d5b15 git Not specified
CNA Linux Linux affected 187a6daf5db45adc807c85bbe285319107bed198 git Not specified
CNA Linux Linux affected d9897bb66ce989325b4bf4cdbb6a799e4ac878b6 git Not specified
CNA Linux Linux affected 4.19.162 4.20 semver Not specified
CNA Linux Linux affected 5.4.82 5.5 semver Not specified
CNA Linux Linux affected 5.9.13 5.10 semver Not specified
CNA Linux Linux affected 5.10 Not specified
CNA Linux Linux unaffected 5.10 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b1e95e3602d8e112458627f14c6c31c21f2188cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c3457a5aae5fb43f7023d3f3dc472c2afa22acf0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cb1afd087aedc90e5274537e4fb9bf3f98e5afdb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/565038b0092f65afe384961c0f548d605bf438b9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/505b6d296c486ef7d1274f279d4c43a172f63224 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7719f6e7ed2ffddc2c3bb61f4467b76d49e0af6a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8bfe746afee38dd6e4348ddcd22d554789dbb9ff 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b8282668d8fa7c61b80e8e4890729031c291a16c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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