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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-89562

ip6_gre: fix hardware header length for NBMA tunnels

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 832ba596494b2c9eac7760259eff2d8b7dcad0ee to < cb1afd087aedc90e5274537e4fb9bf3f98e5afdbaffected
  • 832ba596494b2c9eac7760259eff2d8b7dcad0ee to < 7719f6e7ed2ffddc2c3bb61f4467b76d49e0af6aaffected
  • 832ba596494b2c9eac7760259eff2d8b7dcad0ee to < b1e95e3602d8e112458627f14c6c31c21f2188cbaffected
  • 832ba596494b2c9eac7760259eff2d8b7dcad0ee to < c3457a5aae5fb43f7023d3f3dc472c2afa22acf0affected
  • 832ba596494b2c9eac7760259eff2d8b7dcad0ee to < 8bfe746afee38dd6e4348ddcd22d554789dbb9ffaffected
  • 832ba596494b2c9eac7760259eff2d8b7dcad0ee to < b8282668d8fa7c61b80e8e4890729031c291a16caffected
  • 832ba596494b2c9eac7760259eff2d8b7dcad0ee to < 565038b0092f65afe384961c0f548d605bf438b9affected
  • 832ba596494b2c9eac7760259eff2d8b7dcad0ee to < 505b6d296c486ef7d1274f279d4c43a172f63224affected
  • cf3d9717a5271573fa193c4dfa0df856295d5b15affected
  • 187a6daf5db45adc807c85bbe285319107bed198affected
  • d9897bb66ce989325b4bf4cdbb6a799e4ac878b6affected
  • 4.19.162 to < 4.20affected
  • 5.4.82 to < 5.5affected
  • 5.9.13 to < 5.10affected

Linux Linux

Default version status: affected

  • 5.10affected
  • 0 to < 5.10unaffected
  • 5.10.270 to ≤ 5.10.*unaffected
  • 5.15.221 to ≤ 5.15.*unaffected
  • 6.1.188 to ≤ 6.1.*unaffected
  • 6.6.157 to ≤ 6.6.*unaffected
  • 6.12.109 to ≤ 6.12.*unaffected
  • 6.18.50 to ≤ 6.18.*unaffected
  • 7.2.4 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References